Every time you start up minecraft on ps4, you are logged out of your Microsoft account and have to login again. The screen appears telling you that once you have signed in it will always be connected with your playstation network account. I have multiple freinds on ps4 experiencing the same issue.
Thank you for your report!
We're actually already tracking this issue at MCPE-96138, so I will resolve and link this ticket as a duplicate.
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