diff --git a/ansible/roles/firstboot/files/ansible_payload/bootstrap/roles/metacluster/tasks/authentication.yml b/ansible/roles/firstboot/files/ansible_payload/bootstrap/roles/metacluster/tasks/authentication.yml
index 94900a9..fbf2e83 100644
--- a/ansible/roles/firstboot/files/ansible_payload/bootstrap/roles/metacluster/tasks/authentication.yml
+++ b/ansible/roles/firstboot/files/ansible_payload/bootstrap/roles/metacluster/tasks/authentication.yml
@@ -29,7 +29,7 @@
           namespace: local-user-authenticator
           type: ''
           data:
-            - key: groups:
+            - key: groups
               value: "{{ 'group1,group2' | b64encode }}"
             - key: passwordHash
               value: "{{ item.password | b64encode }}"