well, that is not possible, cause that account is locked out, and it is impossible to get it unlocked, cause the damn system says the service address is incorrect.
The owner, my folks, have tried 4 times calling in, the number is says to call, never could get to a person, the automated system just keeps saying, do it online.....
(they still pay the bill via mail in check anyways, they don't do online payments on most things, its too confusing for them)
Regardless, i do know that screen, I looked at it before the first time the Xfinity TVE stopped working, that section for "Auto Authentication" was not there for me, using the primary account.
Also, that setting refers to Auto login while on your home Xfinity Internet(as it clearly says)....which is not a relevant setting for those of us who are NOT on home Xfinity internet and use TVE.
Whatever is default, is what it has been for me for a year now, since i first used Channels, have not changed anything.