Having the same issue on PS5. My girlfriend joins me on our Realm and loads in as a guest account <My username (1)>. She used to be able to login with her PS5 username, but is no longer able to. Fortunately, she has been able to retain her position and inventory each time she joins, but it's still frustrating that she doesn't have her unique username.
Jeremy Estes
Having the same issue on PS5. My girlfriend joins me on our Realm and loads in as a guest account <My username (1)>. She used to be able to login with her PS5 username, but is no longer able to. Fortunately, she has been able to retain her position and inventory each time she joins, but it's still frustrating that she doesn't have her unique username.