Thanks for the info! Make sure you've tapped the bell for the channel and selected "all notifications". Next, check that you've opted-in to email updates using these steps from YouTube on desktop: https://goo.gl/Smggp7
We'd like to help. Does this happen across devices? Also, here's the Help Center article where you can follow steps to get comment notifications: https://goo.gl/CKNRJA . Hope this helps!
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