We'd like to know more. Do you see any error message while watching the video? Sharing a screenshot would be more helpful. Keep us posted.
Could you try resetting the YouTube app by following these steps: Open YouTube app > Settings > Reset app? Let us know if that works.
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Appreciate your efforts. As a next step, we recommend you to send a feedback report directly from YouTube with these steps: https://yt.be/help/AEQt . While you may not get a direct response, we review everything to investigate the issue and fix it.
End of conversation
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