In Preferences you can delegate the file to others. This request is permitted to the administration process and normally will be processed very quickly on your mail home server.
If you have installed ICM and it could lead you to the other of your two cluster servers, which is not your home server. Then your request will not be processed, because the invoker of the request is not you or your home server.
A possible workaround
Deploy an agent that runs every five or 10 minutes and searches for such bad requests. Change the field where the server is named to the home server of the people and let the AdminP process the request again. You have a time lag of some minutes (the time between the agent runs), but it will wok and the request will be processed.
In R6 this is integrated in the new server code.
Do you have comments on this tip? Let us know.