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 …
If your application is in review, you should hear back shortly. Our review team has not come to a clear decision yet and would like to take a closer look before making a decision by reviewing it again. Hope you hear back soon.