I assume it’s uBlock Origin. I have that and another one that I can’t remember the name of, but it ‘clicks ads’ and you don’t see them. I disabled uBO and left the other running. Worked fine for a few videos Sunday but Monday it was throwing the ‘you can’t use an ad blocker’ again.
But I’d wager just about anything that affects YT on your end will throw that message at this point since they desperately want people to pay for premium or watch 3min of ads per 5min video.