Try clicking the sign in button, then navigating back to the video without actually signing in. Seems to work every time I've tried it so far.

Yea, been having this BIGTIME. Even occurs on grayjay, and pipe apps (newpipe, etc.) Its aggravating. Can't even download vids either, and the ones u have downloaded are held ransom until u turn it off too 😂 at least in my case. Fuck google.

Have you considered trying out NewPipe or its fork Tubular (with SponsorBlocck built in)?

Yeah. Our work endpoint is in AWS. YouTube hates that. So does reddit.

Been seeing that a fair bit too lately. Freetube, Grayjay, and Newpipe seem so sometimes get around it, even if the error is in the browser the video will sometimes load in those apps from the same IP. If you get lucky and find a working invidious/piped instance that might work too.

Otherwise, turning on a VPN and switching between servers will usually eventually lead to a working one. That, and if you're up for it, check to see if your favorite creators are on places like Peertube, Odysee, or Rumble that don't block IPs like YouTube does.

As much as it isn't preferred, I can usually bypass the sign in shenanigans by going directly to the website to watch something without signing in. I usually only get the login prompt when going through my browser or a search engine.

You're on Android use NewPipe and it's forks, personally I prefer Tubular and PipePipe.

Periodically YouTube will break, but both of those forks, as well as new pipe prime, update fairly quickly.

GrayJay is interesting... It has different feel and feature set than newpipe, but it's worth using. I will say I get more login errors with GrayJay, but closing the app and reopening it resolves them immediately.

All the piped apps will be in f-droid/droidify, you can download GrayJay directly, or just scan the QR to add the repo to a FOSS repo manager.