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 …
We understand how important it is to you. As applications are reviewed manually, it might take a bit of time. Our review team is putting extra resources to come to a conclusion about your application. Hope you hear back soon. We appreciate your patience in meantime.