I updated to the newest version of youtube on my ipad, and when I tried to sign in, I keep getting an “authentication error.” I’ve restarted the app, restarted the ipad, removed and reinstalled the app, and it’s the same thing every time. I’m 100% sure I’m entering it correctly, and yet, I always get that error.
Any ideas what this might be?
It sounds like there may be a bug with the new version. If so, you likely will have to wait until Google submits and Apple approves a fixed version.
The only alternative is to revert to the older version. This will only be possible (to my knowledge) if you sync your iPad with iTunes. If you do, then it is likely that the old version is still on the computer if the iPad has not been synced recently. And even if it has synced recently, the old app file might be in the Trash/Recycle Bin on the computer (I know that is what happens when a new version of an app is either downloaded to iTunes or synced from a device on a Mac...the Trash on my Mac has a BUNCH of old version of iOS apps). And even if you have emptied the Trash/Recycle Bin, you could find an old version in your computer's backup (you do backup your computer, right?!? ;) ).
If you have an old version of the app, then just delete the current version from the iPad and the computer (if you have synced after the new version was installed). Then put the old version back in the proper place on the computer and sync the iPad. That should put the old version back.