Can't play my scores in Musescore 4

Just got Musescore 4, put a few notes in a new piano score, the bar that's supposed to move across the page just appears and doesn't move so I can't play…

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I bet you can't play this (impossible) Sheet music for Piano (Solo

ANRI - 悲しみがとまらない I CAN'T STOP THE LONELINESS - Piano

Playback not working; blue bar stuck at start. EDIT: SOLVED

I can't click the paly button

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I can't even play the piano (WIP) Sheet music for Piano (Solo

Scan Music into MuseScore