PlayStation Players Joining Under Their PlayStation Name

The issue is that a player of mine is now entering the game as their PSN ID versus their Xbox Gamertag and this is causing issues with some other features we have. I have had them, log in and out of their Microsoft account on PlayStation multiple times, delete and reinstall the game and restart their console to clear its cache and nothing has worked.

This happened after the most recent update to 1.21.1 that came out today.

Steps To Reproduce:

Update Minecraft
Try To Join Realm
Enters As PSN ID Instead Of Xbox Gamertag