I tried to fix an issue where my session was considered invalid so I couldn't play multiplayer. when I restarted the launcher it lost my minecraft purchase. so all I can do is play the demo.
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well, downloaded the old launcher and it works perfectly

Thank you for your report!
We're tracking this issue in MCL-16570, so this ticket is being resolved and linked as a duplicate.
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It appears to be an issue with the win10/11 launcher.