Hmm double check your bell settings for the channel and make sure you've opted-in to receive all notifications and not just "occassional". After that, make sure your device settings are turned on: https://goo.gl/vgat3Y . Let us know if things still aren't working!
@TeamYouTube can you put creators' videos that I'm subscribed to in my sub box and desktop notification like I have it set to? What's the point in clicking that bell then 
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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