No idea what’s going on. I’ve noticed others pointing this out. But I did see a Tweet from Team YouTube:
Team YouTube Verified account @TeamYouTube
Thanks for your reports about YouTube, YouTube TV and YouTube Music access issues. We’re working on resolving this and will let you know once fixed. We apologize for any inconvenience this may cause and will keep you updated.
3:41 PM – 16 Oct 2018