Error when generating invite codes for a confirmed remote cluster (#28337)

server/channels/api4/remote_cluster.go

@@ -533,6 +533,11 @@ func generateRemoteClusterInvite(c *Context, w http.ResponseWriter, r *http.Requ
 		return
 	}
 
+	if rc.IsConfirmed() {
+		c.Err = model.NewAppError("generateRemoteClusterInvite", "api.remote_cluster.generate_invite_cluster_is_confirmed", nil, "", http.StatusBadRequest)
+		return
+	}
+
 	inviteCode, invErr := c.App.CreateRemoteClusterInvite(rc.RemoteId, url, rc.Token, password)
 	if invErr != nil {
 		c.Err = invErr