r/youtubepremium

I don’t know if it’s a new feature but since yesterday I can’t watch multiple videos on my computer or phone, this is not what I pay for
https://support.google.com/youtube/answer/7361503?co=GENIE.Platform%3DDesktop&oco=1

Trying different methods then got myself into this and can't seem to go back into the payment setting page any more. Please help!