Well, it's Friday and I'm having the same issue. Scheduled live streamed videos were blocked today even after removing youtube restrictions on the appliance. This happened back in August 2020 and I didn't pay attention to it thinking it was related to user's google account restrictions.
I'm going to take CKF_Jeff advise and will do a reboot over the weekend. I've also whitelisted a couple of clients and can get all the nasty stuff on the Internet but not the live streamed videos from youtube.
I'll come back to this next week.