Thanks for the report. Could you check if your subs have 'All notifications' enabled: https://goo.gl/xjZK35 ?
@TeamYouTube My subs are complaining that they aren't getting any of my new post notification in their Notification/Sub box. Mainly old subscribers are facing this issue. Please fix this issue ASAP. This affecting the channel badly. Thank You.
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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