Active Mobile Number is a 'Ghost Line' Unlinked From Account - Need Internal Transfer

I have an active Xfinity Mobile phone number that is functioning normally, but it is stuck as a 'ghost line' because it became unlinked from my billing profile during an account split a year ago. It does not show up on either of my active account portals. I need a Digital Care agent to help me perform a manual Internal Line-to-Line Transfer to link my active mobile number to my current residential internet account profile.