For the most part, yougather.xyz has been working phenomenally for me. Makes it super easy to watch a chronological list of subscriptions in the Watch Later list.
Recently, I noticed that videos were not being added. This came after I enabled 2 factor authentication. I've tried logging into yougather.xyz, but all I get is "Server Error (500)". Clearing cache, using a different computer, using incognito (on chrome), using a different browser does not resolve anything.
Any suggestions going forward? For now I've reverted to using the script + google sheets.