You'll want to check account, device, and channel notification settings. Here's a troubleshooter with the exact steps: https://goo.gl/giVA8o . Keep us posted!
@TeamYouTube dear youtube im seem to be having a problem on my mobile phone that im not reciveing notifications from youtube app saying theirs new videos uploaded is their anything you can do to sort it out please because i have to keep refreshing the app for them to come threw
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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