diff --git a/internal/concierge/server/server.go b/internal/concierge/server/server.go
index 584a84b6..a27aeb72 100644
--- a/internal/concierge/server/server.go
+++ b/internal/concierge/server/server.go
@@ -110,7 +110,7 @@ func (a *App) runServer(ctx context.Context) error {
 	}
 
 	// Initialize the cache of active authenticators.
-	authenticators := authncache.New()
+	authenticators := authncache.New(*cfg.APIGroupSuffix)
 
 	// This cert provider will provide certs to the API server and will
 	// be mutated by a controller to keep the certs up to date with what
diff --git a/internal/controller/authenticator/authncache/cache.go b/internal/controller/authenticator/authncache/cache.go
index 87f317df..7d629eb5 100644
--- a/internal/controller/authenticator/authncache/cache.go
+++ b/internal/controller/authenticator/authncache/cache.go
@@ -15,6 +15,7 @@ import (
 	"k8s.io/klog/v2"
 
 	loginapi "go.pinniped.dev/generated/1.20/apis/concierge/login"
+	"go.pinniped.dev/internal/groupsuffix"
 	"go.pinniped.dev/internal/plog"
 )
 
@@ -26,7 +27,8 @@ var (
 // Cache implements the authenticator.Token interface by multiplexing across a dynamic set of authenticators
 // loaded from authenticator resources.
 type Cache struct {
-	cache sync.Map
+	cache          sync.Map
+	apiGroupSuffix string
 }
 
 type Key struct {
@@ -41,8 +43,8 @@ type Value interface {
 }
 
 // New returns an empty cache.
-func New() *Cache {
-	return &Cache{}
+func New(apiGroupSuffix string) *Cache {
+	return &Cache{apiGroupSuffix: apiGroupSuffix}
 }
 
 // Get an authenticator by key.
@@ -90,7 +92,12 @@ func (c *Cache) AuthenticateTokenCredentialRequest(ctx context.Context, req *log
 		Kind:      req.Spec.Authenticator.Kind,
 	}
 	if req.Spec.Authenticator.APIGroup != nil {
-		key.APIGroup = *req.Spec.Authenticator.APIGroup
+		// The key must always be API group pinniped.dev because that's what the cache filler will always use.
+		apiGroup, replaced := groupsuffix.Unreplace(*req.Spec.Authenticator.APIGroup, c.apiGroupSuffix)
+		if !replaced {
+			return nil, ErrNoSuchAuthenticator
+		}
+		key.APIGroup = apiGroup
 	}
 
 	val := c.Get(key)
diff --git a/internal/controller/authenticator/authncache/cache_test.go b/internal/controller/authenticator/authncache/cache_test.go
index d48a1951..fdb0fd03 100644
--- a/internal/controller/authenticator/authncache/cache_test.go
+++ b/internal/controller/authenticator/authncache/cache_test.go
@@ -28,7 +28,7 @@ func TestCache(t *testing.T) {
 	ctrl := gomock.NewController(t)
 	defer ctrl.Finish()
 
-	cache := New()
+	cache := New("pinniped.dev")
 	require.NotNil(t, cache)
 
 	key1 := Key{Namespace: "foo", Name: "authenticator-one"}
@@ -57,7 +57,7 @@ func TestCache(t *testing.T) {
 		{APIGroup: "b", Kind: "b", Namespace: "b", Name: "b"},
 	}
 	for tries := 0; tries < 10; tries++ {
-		cache := New()
+		cache := New("pinniped.dev")
 		for _, i := range rand.Perm(len(keysInExpectedOrder)) {
 			cache.Store(keysInExpectedOrder[i], nil)
 		}
@@ -91,46 +91,48 @@ func TestAuthenticateTokenCredentialRequest(t *testing.T) {
 		Name:      validRequest.Spec.Authenticator.Name,
 	}
 
-	mockCache := func(t *testing.T, res *authenticator.Response, authenticated bool, err error) *Cache {
+	mockCache := func(t *testing.T, apiGroupSuffix string, expectAuthenticatorToBeCalled bool, res *authenticator.Response, authenticated bool, err error) *Cache {
 		ctrl := gomock.NewController(t)
 		t.Cleanup(ctrl.Finish)
 		m := mocktokenauthenticator.NewMockToken(ctrl)
-		m.EXPECT().AuthenticateToken(audienceFreeContext{}, validRequest.Spec.Token).Return(res, authenticated, err)
-		c := New()
+		if expectAuthenticatorToBeCalled {
+			m.EXPECT().AuthenticateToken(audienceFreeContext{}, validRequest.Spec.Token).Return(res, authenticated, err)
+		}
+		c := New(apiGroupSuffix)
 		c.Store(validRequestKey, m)
 		return c
 	}
 
 	t.Run("no such authenticator", func(t *testing.T) {
-		c := New()
+		c := New("pinniped.dev")
 		res, err := c.AuthenticateTokenCredentialRequest(context.Background(), validRequest.DeepCopy())
 		require.EqualError(t, err, "no such authenticator")
 		require.Nil(t, res)
 	})
 
 	t.Run("authenticator returns error", func(t *testing.T) {
-		c := mockCache(t, nil, false, fmt.Errorf("some authenticator error"))
+		c := mockCache(t, "pinniped.dev", true, nil, false, fmt.Errorf("some authenticator error"))
 		res, err := c.AuthenticateTokenCredentialRequest(context.Background(), validRequest.DeepCopy())
 		require.EqualError(t, err, "some authenticator error")
 		require.Nil(t, res)
 	})
 
 	t.Run("authenticator returns unauthenticated without error", func(t *testing.T) {
-		c := mockCache(t, &authenticator.Response{}, false, nil)
+		c := mockCache(t, "pinniped.dev", true, &authenticator.Response{}, false, nil)
 		res, err := c.AuthenticateTokenCredentialRequest(context.Background(), validRequest.DeepCopy())
 		require.NoError(t, err)
 		require.Nil(t, res)
 	})
 
 	t.Run("authenticator returns nil response without error", func(t *testing.T) {
-		c := mockCache(t, nil, true, nil)
+		c := mockCache(t, "pinniped.dev", true, nil, true, nil)
 		res, err := c.AuthenticateTokenCredentialRequest(context.Background(), validRequest.DeepCopy())
 		require.NoError(t, err)
 		require.Nil(t, res)
 	})
 
 	t.Run("authenticator returns response with nil user", func(t *testing.T) {
-		c := mockCache(t, &authenticator.Response{}, true, nil)
+		c := mockCache(t, "pinniped.dev", true, &authenticator.Response{}, true, nil)
 		res, err := c.AuthenticateTokenCredentialRequest(context.Background(), validRequest.DeepCopy())
 		require.NoError(t, err)
 		require.Nil(t, res)
@@ -151,7 +153,7 @@ func TestAuthenticateTokenCredentialRequest(t *testing.T) {
 				}
 			},
 		)
-		c := New()
+		c := New("pinniped.dev")
 		c.Store(validRequestKey, m)
 
 		ctx, cancel := context.WithCancel(context.Background())
@@ -171,7 +173,7 @@ func TestAuthenticateTokenCredentialRequest(t *testing.T) {
 			Groups: []string{"test-group-1", "test-group-2"},
 			Extra:  map[string][]string{"extra-key-1": {"extra-value-1", "extra-value-2"}},
 		}
-		c := mockCache(t, &authenticator.Response{User: &userInfo}, true, nil)
+		c := mockCache(t, "pinniped.dev", true, &authenticator.Response{User: &userInfo}, true, nil)
 
 		audienceCtx := authenticator.WithAudiences(context.Background(), authenticator.Audiences{"test-audience-1"})
 		res, err := c.AuthenticateTokenCredentialRequest(audienceCtx, validRequest.DeepCopy())
@@ -182,6 +184,50 @@ func TestAuthenticateTokenCredentialRequest(t *testing.T) {
 		require.Equal(t, []string{"test-group-1", "test-group-2"}, res.GetGroups())
 		require.Equal(t, map[string][]string{"extra-key-1": {"extra-value-1", "extra-value-2"}}, res.GetExtra())
 	})
+
+	t.Run("using a non-default API group suffix still performs the cache lookup using the pinniped.dev suffix", func(t *testing.T) {
+		authenticationGroupWithCustomSuffix := "authentication.concierge.custom-suffix.com"
+		validRequestForAlternateAPIGroup := loginapi.TokenCredentialRequest{
+			ObjectMeta: metav1.ObjectMeta{
+				Namespace: "test-namespace",
+			},
+			Spec: loginapi.TokenCredentialRequestSpec{
+				Authenticator: corev1.TypedLocalObjectReference{
+					APIGroup: &authenticationGroupWithCustomSuffix,
+					Kind:     "WebhookAuthenticator",
+					Name:     "test-name",
+				},
+				Token: "test-token",
+			},
+			Status: loginapi.TokenCredentialRequestStatus{},
+		}
+
+		userInfo := user.DefaultInfo{
+			Name:   "test-user",
+			UID:    "test-uid",
+			Groups: []string{"test-group-1", "test-group-2"},
+			Extra:  map[string][]string{"extra-key-1": {"extra-value-1", "extra-value-2"}},
+		}
+		c := mockCache(t, "custom-suffix.com", true, &authenticator.Response{User: &userInfo}, true, nil)
+
+		audienceCtx := authenticator.WithAudiences(context.Background(), authenticator.Audiences{"test-audience-1"})
+		res, err := c.AuthenticateTokenCredentialRequest(audienceCtx, validRequestForAlternateAPIGroup.DeepCopy())
+		require.NoError(t, err)
+		require.NotNil(t, res)
+		require.Equal(t, "test-user", res.GetName())
+		require.Equal(t, "test-uid", res.GetUID())
+		require.Equal(t, []string{"test-group-1", "test-group-2"}, res.GetGroups())
+		require.Equal(t, map[string][]string{"extra-key-1": {"extra-value-1", "extra-value-2"}}, res.GetExtra())
+	})
+
+	t.Run("using a non-default API group suffix and the incoming request mentions a different API group, results in no such authenticator", func(t *testing.T) {
+		c := mockCache(t, "custom-suffix.com", false, &authenticator.Response{User: &user.DefaultInfo{Name: "someone"}}, true, nil)
+
+		// Note that the validRequest.Spec.Authenticator.APIGroup value uses "pinniped.dev", not "custom-suffix.com"
+		res, err := c.AuthenticateTokenCredentialRequest(context.Background(), validRequest.DeepCopy())
+		require.EqualError(t, err, "no such authenticator")
+		require.Nil(t, res)
+	})
 }
 
 type audienceFreeContext struct{}
diff --git a/internal/controller/authenticator/cachecleaner/cachecleaner_test.go b/internal/controller/authenticator/cachecleaner/cachecleaner_test.go
index a735900b..e4a9cad6 100644
--- a/internal/controller/authenticator/cachecleaner/cachecleaner_test.go
+++ b/internal/controller/authenticator/cachecleaner/cachecleaner_test.go
@@ -153,7 +153,7 @@ func TestController(t *testing.T) {
 
 			fakeClient := pinnipedfake.NewSimpleClientset(tt.objects...)
 			informers := pinnipedinformers.NewSharedInformerFactory(fakeClient, 0)
-			cache := authncache.New()
+			cache := authncache.New("pinniped.dev")
 			if tt.initialCache != nil {
 				tt.initialCache(t, cache)
 			}
diff --git a/internal/controller/authenticator/jwtcachefiller/jwtcachefiller_test.go b/internal/controller/authenticator/jwtcachefiller/jwtcachefiller_test.go
index 17b8073d..b1aee0d8 100644
--- a/internal/controller/authenticator/jwtcachefiller/jwtcachefiller_test.go
+++ b/internal/controller/authenticator/jwtcachefiller/jwtcachefiller_test.go
@@ -327,7 +327,7 @@ func TestController(t *testing.T) {
 
 			fakeClient := pinnipedfake.NewSimpleClientset(tt.jwtAuthenticators...)
 			informers := pinnipedinformers.NewSharedInformerFactory(fakeClient, 0)
-			cache := authncache.New()
+			cache := authncache.New("pinniped.dev")
 			testLog := testlogger.New(t)
 
 			if tt.cache != nil {
diff --git a/internal/controller/authenticator/webhookcachefiller/webhookcachefiller_test.go b/internal/controller/authenticator/webhookcachefiller/webhookcachefiller_test.go
index 6b0bec0b..27dd1637 100644
--- a/internal/controller/authenticator/webhookcachefiller/webhookcachefiller_test.go
+++ b/internal/controller/authenticator/webhookcachefiller/webhookcachefiller_test.go
@@ -90,7 +90,7 @@ func TestController(t *testing.T) {
 
 			fakeClient := pinnipedfake.NewSimpleClientset(tt.webhooks...)
 			informers := pinnipedinformers.NewSharedInformerFactory(fakeClient, 0)
-			cache := authncache.New()
+			cache := authncache.New("pinniped.dev")
 			testLog := testlogger.New(t)
 
 			controller := New(cache, informers.Authentication().V1alpha1().WebhookAuthenticators(), testLog)
diff --git a/internal/groupsuffix/groupsuffix.go b/internal/groupsuffix/groupsuffix.go
index 24f6f96a..bdd1bad1 100644
--- a/internal/groupsuffix/groupsuffix.go
+++ b/internal/groupsuffix/groupsuffix.go
@@ -63,7 +63,7 @@ func New(apiGroupSuffix string) kubeclient.Middleware {
 
 		kubeclient.MiddlewareFunc(func(_ context.Context, rt kubeclient.RoundTrip) {
 			// always unreplace owner refs with apiGroupSuffix because we can consume those objects across all verbs
-			rt.MutateResponse(mutateOwnerRefs(unreplace, apiGroupSuffix))
+			rt.MutateResponse(mutateOwnerRefs(Unreplace, apiGroupSuffix))
 		}),
 	}
 }
@@ -115,7 +115,8 @@ func Replace(baseAPIGroup, apiGroupSuffix string) (string, bool) {
 	return strings.TrimSuffix(baseAPIGroup, pinnipedDefaultSuffix) + apiGroupSuffix, true
 }
 
-func unreplace(baseAPIGroup, apiGroupSuffix string) (string, bool) {
+// Unreplace is like performing an undo of Replace().
+func Unreplace(baseAPIGroup, apiGroupSuffix string) (string, bool) {
 	if !strings.HasSuffix(baseAPIGroup, "."+apiGroupSuffix) {
 		return "", false
 	}
diff --git a/internal/groupsuffix/groupsuffix_test.go b/internal/groupsuffix/groupsuffix_test.go
index 2b4a58a5..e649e1d7 100644
--- a/internal/groupsuffix/groupsuffix_test.go
+++ b/internal/groupsuffix/groupsuffix_test.go
@@ -441,10 +441,12 @@ func TestMiddlware(t *testing.T) {
 }
 
 func TestReplaceError(t *testing.T) {
-	_, ok := Replace("bad-suffix-that-doesnt-end-in-pinniped-dot-dev", "shouldnt-matter.com")
+	s, ok := Replace("bad-suffix-that-doesnt-end-in-pinniped-dot-dev", "shouldnt-matter.com")
+	require.Equal(t, "", s)
 	require.False(t, ok)
 
-	_, ok = Replace("bad-suffix-that-end-in.prefixed-pinniped.dev", "shouldnt-matter.com")
+	s, ok = Replace("bad-suffix-that-end-in.prefixed-pinniped.dev", "shouldnt-matter.com")
+	require.Equal(t, "", s)
 	require.False(t, ok)
 }
 
@@ -452,6 +454,27 @@ func TestReplaceSuffix(t *testing.T) {
 	s, ok := Replace("something.pinniped.dev.something-else.pinniped.dev", "tuna.io")
 	require.Equal(t, "something.pinniped.dev.something-else.tuna.io", s)
 	require.True(t, ok)
+
+	// When the replace wasn't actually needed, it still returns true.
+	s, ok = Unreplace("something.pinniped.dev", "pinniped.dev")
+	require.Equal(t, "something.pinniped.dev", s)
+	require.True(t, ok)
+}
+
+func TestUnreplaceSuffix(t *testing.T) {
+	s, ok := Unreplace("something.pinniped.dev.something-else.tuna.io", "tuna.io")
+	require.Equal(t, "something.pinniped.dev.something-else.pinniped.dev", s)
+	require.True(t, ok)
+
+	// When the unreplace wasn't actually needed, it still returns true.
+	s, ok = Unreplace("something.pinniped.dev", "pinniped.dev")
+	require.Equal(t, "something.pinniped.dev", s)
+	require.True(t, ok)
+
+	// When the unreplace was needed but did not work, return false.
+	s, ok = Unreplace("something.pinniped.dev.something-else.tuna.io", "salmon.io")
+	require.Equal(t, "", s)
+	require.False(t, ok)
 }
 
 func TestValidate(t *testing.T) {
diff --git a/pkg/conciergeclient/conciergeclient.go b/pkg/conciergeclient/conciergeclient.go
index 0bebd3d2..6f4c704e 100644
--- a/pkg/conciergeclient/conciergeclient.go
+++ b/pkg/conciergeclient/conciergeclient.go
@@ -12,7 +12,7 @@ import (
 	"net/url"
 	"strings"
 
-	corev1 "k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	clientauthenticationv1beta1 "k8s.io/client-go/pkg/apis/clientauthentication/v1beta1"
 	"k8s.io/client-go/tools/clientcmd"
@@ -34,11 +34,12 @@ type Option func(*Client) error
 
 // Client is a configuration for talking to the Pinniped concierge.
 type Client struct {
-	namespace      string
-	authenticator  *corev1.TypedLocalObjectReference
-	caBundle       string
-	endpoint       *url.URL
-	apiGroupSuffix string
+	namespace         string
+	authenticatorName string
+	authenticatorKind string
+	caBundle          string
+	endpoint          *url.URL
+	apiGroupSuffix    string
 }
 
 // WithNamespace configures the namespace where the TokenCredentialRequest is to be sent.
@@ -55,18 +56,15 @@ func WithAuthenticator(authType, authName string) Option {
 		if authName == "" {
 			return fmt.Errorf("authenticator name must not be empty")
 		}
-		authenticator := corev1.TypedLocalObjectReference{Name: authName}
+		c.authenticatorName = authName
 		switch strings.ToLower(authType) {
 		case "webhook":
-			authenticator.APIGroup = &auth1alpha1.SchemeGroupVersion.Group
-			authenticator.Kind = "WebhookAuthenticator"
+			c.authenticatorKind = "WebhookAuthenticator"
 		case "jwt":
-			authenticator.APIGroup = &auth1alpha1.SchemeGroupVersion.Group
-			authenticator.Kind = "JWTAuthenticator"
+			c.authenticatorKind = "JWTAuthenticator"
 		default:
 			return fmt.Errorf(`invalid authenticator type: %q, supported values are "webhook" and "jwt"`, authType)
 		}
-		c.authenticator = &authenticator
 		return nil
 	}
 }
@@ -133,7 +131,7 @@ func New(opts ...Option) (*Client, error) {
 			return nil, err
 		}
 	}
-	if c.authenticator == nil {
+	if c.authenticatorName == "" {
 		return nil, fmt.Errorf("WithAuthenticator must be specified")
 	}
 	if c.endpoint == nil {
@@ -180,13 +178,18 @@ func (c *Client) ExchangeToken(ctx context.Context, token string) (*clientauthen
 	if err != nil {
 		return nil, err
 	}
+	replacedAPIGroupName, _ := groupsuffix.Replace(auth1alpha1.SchemeGroupVersion.Group, c.apiGroupSuffix)
 	resp, err := clientset.LoginV1alpha1().TokenCredentialRequests(c.namespace).Create(ctx, &loginv1alpha1.TokenCredentialRequest{
 		ObjectMeta: metav1.ObjectMeta{
 			Namespace: c.namespace,
 		},
 		Spec: loginv1alpha1.TokenCredentialRequestSpec{
-			Token:         token,
-			Authenticator: *c.authenticator,
+			Token: token,
+			Authenticator: v1.TypedLocalObjectReference{
+				APIGroup: &replacedAPIGroupName,
+				Kind:     c.authenticatorKind,
+				Name:     c.authenticatorName,
+			},
 		},
 	}, metav1.CreateOptions{})
 	if err != nil {
diff --git a/pkg/conciergeclient/conciergeclient_test.go b/pkg/conciergeclient/conciergeclient_test.go
index 937db5f0..ddbe5025 100644
--- a/pkg/conciergeclient/conciergeclient_test.go
+++ b/pkg/conciergeclient/conciergeclient_test.go
@@ -21,6 +21,7 @@ import (
 
 	loginv1alpha1 "go.pinniped.dev/generated/1.20/apis/concierge/login/v1alpha1"
 	"go.pinniped.dev/internal/certauthority"
+	"go.pinniped.dev/internal/here"
 	"go.pinniped.dev/internal/testutil"
 )
 
@@ -220,47 +221,7 @@ func TestExchangeToken(t *testing.T) {
 		t.Parallel()
 		expires := metav1.NewTime(time.Now().Truncate(time.Second))
 
-		// Start a test server that returns successfully and asserts various properties of the request.
-		caBundle, endpoint := testutil.TLSTestServer(t, func(w http.ResponseWriter, r *http.Request) {
-			require.Equal(t, http.MethodPost, r.Method)
-			require.Equal(t, "/apis/login.concierge.pinniped.dev/v1alpha1/namespaces/test-namespace/tokencredentialrequests", r.URL.Path)
-			require.Equal(t, "application/json", r.Header.Get("content-type"))
-
-			body, err := ioutil.ReadAll(r.Body)
-			require.NoError(t, err)
-			require.JSONEq(t,
-				`{
-				  "kind": "TokenCredentialRequest",
-				  "apiVersion": "login.concierge.pinniped.dev/v1alpha1",
-				  "metadata": {
-					"creationTimestamp": null,
-					"namespace": "test-namespace"
-				  },
-				  "spec": {
-					"token": "test-token",
-					"authenticator": {
-						"apiGroup": "authentication.concierge.pinniped.dev",
-						"kind": "WebhookAuthenticator",
-						"name": "test-webhook"
-					}
-				  },
-				  "status": {}
-				}`,
-				string(body),
-			)
-
-			w.Header().Set("content-type", "application/json")
-			_ = json.NewEncoder(w).Encode(&loginv1alpha1.TokenCredentialRequest{
-				TypeMeta: metav1.TypeMeta{APIVersion: "login.concierge.pinniped.dev/v1alpha1", Kind: "TokenCredentialRequest"},
-				Status: loginv1alpha1.TokenCredentialRequestStatus{
-					Credential: &loginv1alpha1.ClusterCredential{
-						ExpirationTimestamp:   expires,
-						ClientCertificateData: "test-certificate",
-						ClientKeyData:         "test-key",
-					},
-				},
-			})
-		})
+		caBundle, endpoint := runFakeServer(t, expires, "pinniped.dev")
 
 		client, err := New(WithNamespace("test-namespace"), WithEndpoint(endpoint), WithCABundle(caBundle), WithAuthenticator("webhook", "test-webhook"))
 		require.NoError(t, err)
@@ -279,4 +240,78 @@ func TestExchangeToken(t *testing.T) {
 			},
 		}, got)
 	})
+
+	t.Run("changing the API group suffix for the client sends the custom suffix on the CredentialRequest's APIGroup and on its spec.Authenticator.APIGroup", func(t *testing.T) {
+		t.Parallel()
+		expires := metav1.NewTime(time.Now().Truncate(time.Second))
+
+		caBundle, endpoint := runFakeServer(t, expires, "suffix.com")
+
+		client, err := New(WithAPIGroupSuffix("suffix.com"), WithNamespace("test-namespace"), WithEndpoint(endpoint), WithCABundle(caBundle), WithAuthenticator("webhook", "test-webhook"))
+		require.NoError(t, err)
+
+		got, err := client.ExchangeToken(ctx, "test-token")
+		require.NoError(t, err)
+		require.Equal(t, &clientauthenticationv1beta1.ExecCredential{
+			TypeMeta: metav1.TypeMeta{
+				Kind:       "ExecCredential",
+				APIVersion: "client.authentication.k8s.io/v1beta1",
+			},
+			Status: &clientauthenticationv1beta1.ExecCredentialStatus{
+				ClientCertificateData: "test-certificate",
+				ClientKeyData:         "test-key",
+				ExpirationTimestamp:   &expires,
+			},
+		}, got)
+	})
+}
+
+// Start a test server that returns successfully and asserts various properties of the request.
+func runFakeServer(t *testing.T, expires metav1.Time, pinnipedAPIGroupSuffix string) (string, string) {
+	caBundle, endpoint := testutil.TLSTestServer(t, func(w http.ResponseWriter, r *http.Request) {
+		require.Equal(t, http.MethodPost, r.Method)
+		require.Equal(t,
+			fmt.Sprintf("/apis/login.concierge.%s/v1alpha1/namespaces/test-namespace/tokencredentialrequests", pinnipedAPIGroupSuffix),
+			r.URL.Path)
+		require.Equal(t, "application/json", r.Header.Get("content-type"))
+
+		body, err := ioutil.ReadAll(r.Body)
+		require.NoError(t, err)
+		require.JSONEq(t, here.Docf(
+			`{
+				  "kind": "TokenCredentialRequest",
+				  "apiVersion": "login.concierge.%s/v1alpha1",
+				  "metadata": {
+					"creationTimestamp": null,
+					"namespace": "test-namespace"
+				  },
+				  "spec": {
+					"token": "test-token",
+					"authenticator": {
+						"apiGroup": "authentication.concierge.%s",
+						"kind": "WebhookAuthenticator",
+						"name": "test-webhook"
+					}
+				  },
+				  "status": {}
+				}`, pinnipedAPIGroupSuffix, pinnipedAPIGroupSuffix),
+			string(body),
+		)
+
+		w.Header().Set("content-type", "application/json")
+		_ = json.NewEncoder(w).Encode(&loginv1alpha1.TokenCredentialRequest{
+			TypeMeta: metav1.TypeMeta{
+				APIVersion: fmt.Sprintf("login.concierge.%s/v1alpha1", pinnipedAPIGroupSuffix),
+				Kind:       "TokenCredentialRequest",
+			},
+			Status: loginv1alpha1.TokenCredentialRequestStatus{
+				Credential: &loginv1alpha1.ClusterCredential{
+					ExpirationTimestamp:   expires,
+					ClientCertificateData: "test-certificate",
+					ClientKeyData:         "test-key",
+				},
+			},
+		})
+	})
+	return caBundle, endpoint
 }
diff --git a/test/library/client.go b/test/library/client.go
index 011f2b77..392c153e 100644
--- a/test/library/client.go
+++ b/test/library/client.go
@@ -180,8 +180,11 @@ func CreateTestWebhookAuthenticator(ctx context.Context, t *testing.T) corev1.Ty
 		require.NoErrorf(t, err, "could not cleanup test WebhookAuthenticator %s/%s", webhook.Namespace, webhook.Name)
 	})
 
+	apiGroup, replacedSuffix := groupsuffix.Replace(auth1alpha1.SchemeGroupVersion.Group, testEnv.APIGroupSuffix)
+	require.True(t, replacedSuffix)
+
 	return corev1.TypedLocalObjectReference{
-		APIGroup: &auth1alpha1.SchemeGroupVersion.Group,
+		APIGroup: &apiGroup,
 		Kind:     "WebhookAuthenticator",
 		Name:     webhook.Name,
 	}
@@ -250,8 +253,11 @@ func CreateTestJWTAuthenticator(ctx context.Context, t *testing.T, spec auth1alp
 		require.NoErrorf(t, err, "could not cleanup test JWTAuthenticator %s/%s", jwtAuthenticator.Namespace, jwtAuthenticator.Name)
 	})
 
+	apiGroup, replacedSuffix := groupsuffix.Replace(auth1alpha1.SchemeGroupVersion.Group, testEnv.APIGroupSuffix)
+	require.True(t, replacedSuffix)
+
 	return corev1.TypedLocalObjectReference{
-		APIGroup: &auth1alpha1.SchemeGroupVersion.Group,
+		APIGroup: &apiGroup,
 		Kind:     "JWTAuthenticator",
 		Name:     jwtAuthenticator.Name,
 	}