Reviewing your account and notification settings might help fix the issue. Here you go: https://goo.gl/DyMrJ6 . Hope this helps.
@TeamYouTube I have noticed over the past mouth or 2 that all of my notification for my favorite YouTube's have been turned off. I never got any notification and I thought they fell off the face of the earth but it turns out that some how my notification have been turned off.
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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