What about inmutable systems? My app (using scuttlebutt) creates an 'account' but it's located as crypto keys only within the app and apple keychain. So far the apple reviewers refused to believe that it works like. It's open source, they've got the code... but still.... Same is true for anything crypto. The account as it were exists on many devices, but it's not something you as the app creator can manage. I think a…
But in your case I’m not sure what exactly is the problem other than Apple doesn’t believe you… you can still delete the account it’s just deleted locally.
And you may be required to delete any server side identifiers if such exist.