@TeamYouTube I just got this in the middle of watching a youtube video on my accountpic.twitter.com/WFDjzXOLr7
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Hmm, have you tried logging back in to your account? If you still have the error, hopefully some quick troubleshooting steps will resolve the issue–clearing cache and cookies normally helps. Here's how: https://yt.be/help/Cko1 . You can also try it on a different device/browser.