How do you change Xfinity accounts (TV Provider) on iPhone? I can remove the TV Provider but it doesn't allow me to sign out or ask me to sign in when I add the same provider.

I need to switch my Xfinity sign on as my TV Provider. My TV Provider on my iPhone is set as Xfinity but it has my old email from a past Xfinity account. I need to sign out of that account and put my new account as my TV Provider. I've removed the TV Provider and reset my iPhone but when I come back in and set Xfinity as the TV Provider it doesn't ask for sign in and continues to use my old account. Any suggestions on how to sign out an sign back in. Using iOs 14.3.