diff --git a/pkg/groups/service.go b/pkg/groups/service.go
index 7d0088b2f..4ab6432b7 100644
--- a/pkg/groups/service.go
+++ b/pkg/groups/service.go
@@ -354,7 +354,7 @@ func (s *Service) AssignIdentities(ctx context.Context, ID string, identities ..
 
 	for _, identity := range identities {
 		// TODO @shipperizer swap user for identity if/when model changes
-		ids = append(ids, *ofga.NewTuple(fmt.Sprintf("user:%s", identity), MEMBER_RELATION, s.buildGroupMember(ctx, ID)))
+		ids = append(ids, *ofga.NewTuple(fmt.Sprintf("user:%s", identity), MEMBER_RELATION, fmt.Sprintf("group:%s", ID)))
 	}
 
 	err := s.ofga.WriteTuples(ctx, ids...)
diff --git a/pkg/groups/service_test.go b/pkg/groups/service_test.go
index bf772bcec..4411d5b8d 100644
--- a/pkg/groups/service_test.go
+++ b/pkg/groups/service_test.go
@@ -541,7 +541,7 @@ func TestServiceAssignIdentities(t *testing.T) {
 					ids := make([]ofga.Tuple, 0)
 
 					for _, i := range test.input.identities {
-						ids = append(ids, *ofga.NewTuple(fmt.Sprintf("user:%s", i), MEMBER_RELATION, fmt.Sprintf("group:%s#%s", test.input.group, MEMBER_RELATION)))
+						ids = append(ids, *ofga.NewTuple(fmt.Sprintf("user:%s", i), MEMBER_RELATION, fmt.Sprintf("group:%s", test.input.group)))
 					}
 
 					if !reflect.DeepEqual(ids, tuples) {