Thread:AdmiN-fduser/@comment-24703240-20140525231700/@comment-366087-20140613114859

Most likely it was globally disabled due to the name being deemed as "impersonating staff", which is a violation of the Terms of Use. Even if "Admin" was an admin on a wiki or two, they would not be on other wikis they'd visit, yet casual users might be misled into believing they were.

As noted, the specifics of global blocks and disablements are only discussed with the user in private.