Youtube login with a Google account
Usually I’m not logged in to youtube with my Google account, but sometimes you want to, because you want to subscribe to a channel to show your support. When I logged in to my Google account and was redirected back to youtube, I got an oops and was effectively not logged in.
Long story short: disabling “Enhanced Tracking Protection” for ‘accounts.google.com’ fixed it for me.
Please note: I am using Firefox Multi-Account Containers, which might influenced my situation.