Auth failed again.
I logged in to the Xfinity account in a seperate browser, got that screen and clicked Ask me later.
It then asked me to add a mobile phone# and again I clicked Ask me later.
Logged off and back in and those annoying requests went away.
I was then able to rescan the individual channels without error.
Guess I should login weekly to this secondary viewer only account to see what new annoyances they come up with. 