So this is an issue that seems to have just developed in the last day or two. If you have YouTube Premium through a Google Play Music subscription and your billing recurs on the 27th (US timezones) then you likely cannot access those YouTube features anymore.
It seems to be contained to accounts on/around that day only which is really interesting. Also, quite a few people already have contacted support and it seems that Google isn't able to fix the subscription issues in chat support threads, leading me to think it's not just a flag that a support technician can flip on/off?
I'm still kinda new on HN, so forgive me if this info is incorrectly submitted. I thought it would be a good discussion topic around billing and the complexities, even at huge companies like Google.