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 …
Thanks for reaching out. Could you tell us at what stage of the review process your channel is on? Sharing a screenshot of your monetization page will help us too: https://goo.gl/BB2MFg . Keep us posted.