Username has already been taken

Hello. I’ve begun adding users to my plex account which is fine. But I am trying to change the master user name to my name Rob instead of my id ylomnstr but when I try, it says Username has already been taken. When I go to users, I only see my ID of ylomnstr and the new one I created Lyla. I don’t see any Rob anywhere. Any idea why it won’t let me change my main user name?

Plex user names must be unique among all plex users worldwide. Because these user names can also be used to log in to a plex account.
Very likely, such a common name is already in use by a different plex user.

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