This looks like a temporary issue that should have been resolved already. Try fully logging out and logging back in. We are tracking login issues here, you can check for more info! nitter.vloup.ch/MojangStatus/sta… ^SC
Minecraft Bedrock- PS4 only: Some players may be getting errors when trying to log into a Microsoft account (account already in use, error signing in). We are working on getting this resolved ASAP. We will let you know when we have news. Thanks for your patience! - HZ
If the gamertag seems unfamiliar then it may be because you linked a Microsoft profile that did not have a gamertag previously. However this shouldn't change each time as you can only link one account.^SC
Sorry to hear that is happening! We are tracking this issue and are working on a fix for the problem for the PS4 Edition. If you are not on the PS4 Edition please submit a bug report here: bugs.mojang.com/ ^SC
Multiplayer and Realms are not yet available for PS4. I don't have a release date for you but keep your eyes out for it. If you are not on PS4 please submit a bug report.^SC
This looks like a temporary issue that should have been resolved already. Try fully logging out and logging back in. We are tracking login issues here, you can check for more info! bugs.mojang.com/browse/MCPE-… ^SC
Sorry to hear that is happening! We are tracking this issue and are working on a fix for the problem. Find out more here: bugs.mojang.com/browse/MCPE-… ^SC