Hi Devix. I'm Greg, an installation specialist, 10 years awarded Windows MVP, and Volunteer Moderator, here to help you.
See fixes for Game Bar here:
https://support.microsoft.com/en-us/help/402858...
https://www.askvg.com/fix-game-bar-is-not-openi...
https://www.thewindowsclub.com/cant-record-righ...
https://www.makeuseof.com/tag/xbox-game-bar-not...
https://www.guidingtech.com/windows-10-game-bar...
If that doesn't help then Reset Game Bar in Settings > Apps > Apps & Features > Xbox Game bar > Advanced Options.
If that doesn't help then re-register Xbox Game bar from Option 2 here:
http://www.tenforums.com/tutorials/3175-apps-re...
And if that doesn't help then uninstall Game Bar in App Settings above, restart PC, reinstall Game Bar from Microsoft Store Settings > My Library.
I hope this helps. Feel free to ask back any questions and keep me posted. If you will wait to choose if I solved your problem, I will keep working with you until it's resolved.
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