You'll want to check account, device, and channel notification settings. Here's a troubleshooter with the exact steps: https://goo.gl/giVA8o . Let us know!
@TeamYouTube your notifications on YouTube ISN’T WORKING!!! I’m missing watching a ton of videos! I want to support my vloggers.
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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