The Subscriptions feed error message is resolved for almost everyone. If you're still seeing it, know that it will be fixed soon – thanks for your continued patience! You can follow along here for any additional updates: https://yt.be/help/CBxM https://twitter.com/TeamYouTube/status/1119013035580878848 …
Irish + Tina + Anne
Did you switch off "Protect young" system that block posting comments?
It is the worst algorithm. There is a big mistake 

Your algorithms block comment without checking.