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 I’ve gotten YT notifications for uploaded videos, but, in the last ~12 hours, they’ve yet to appear in my notifications box, and I’ve reinstalled the app and checked the desktop site to make sure.pic.twitter.com/ZZo7SKBC2V
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Just had a look, and all the notifications (to my knowledge) have re-appeared and I was re-sent every iPhone push notification for each, so I believe that it’s now all good to go. :)
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