What troubleshooting steps have you tried when you're trying to sign in? If you haven't already, you can try clearing your browser's cache & cookies and restarting it. More fix here: https://yt.be/help/sWdH . Let us know if that works.
@TeamYouTube Is there a problem on your platform? Can log in to YouTube for some reason.
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Got it to work after signing out everywhere
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