Did a settings reset....now the problem looks like this: "Couldn’t sign you in This browser or app may not be secure. Learn more Try using a different browser. If you’re already using a supported browser, you can try again to sign in."
When trying to log in to YouTube account using my account...SplitCam reports "Can't continue without a successful authentication" However SplitCam has permissions in Google account (Linked Apps and Services)
It's good that broadcasting using the key works...but I would like it to work and account authorization.