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'd like to help. What device are you streaming YouTube TV on? Also, have you already tried troubleshooting the issue using the steps from our Help Center article on video streaming issues: https://yt.be/help/xDMM ? Keep us posted.