Thanks for your patience, everyone!
Mojang Status
 @MojangStatus
10 Dec 2019
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
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When I try it, I get logged into OTHER PEOPLE'S Microsoft Accounts (random user each time) Never logs into my own though!
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Replying to @Bovrillor
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

Dec 16, 2019 · 5:15 AM UTC