If you wait a few seconds, Home Assistant will connect and the screen will go away.
I have no experience with multi-users. My guess is to create an extra PS4 media player and add as device, since you need to pair it within a user account. Then use that PS4 media player for other users.
I have my Playstation running in HA for a while. Now i’m trying to make a custom card with button-cards for select a game. i’m wondering why is there no on/off button in the stanard media-control card for de media_player.playstation_4?