Sorry to hear of your issue, you may want to do a hard reset and try again.
@TeamYouTube @XboxSupport I can’t login to my YouTube account on my Xbox one. It keeps saying something went wrong. I’ve tried everything. Hard reset, re installing app but it doesn’t work. Help please 
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I’ve been trying hard reset since yesterday but it didn’t work

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Thanks for reaching out. We've seen similar reports and we'll pass it along to the team. Appreciate your patience.
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Chaeyoung
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