Email Inbox Won't Sync [Edited]

@user_qmozrw 

Thanks for reaching out to us. We apologize for any inconvenience you're having.

To clarify, are you trying to add on your preferred e-mail address to your Xfinity account https://www.xfinity.com/support/articles/add-modify-alternate-email-address

, or are you trying to use a third-party mail program in connection with your personal preferred e-mail https://www.xfinity.com/support/articles/third-party-email-access  ?