Unable to add Personal Email to Primary Account - "You Can't Make This Change Right Now"

For the past two days I have been trying to add a personal email to my primary Xfinity account, to implement two-factor security. I was able to successfully add and verify my mobile number, but every time I try to add a personal email I get the error "You can't make this change right now - We need to verify your contact information to keep your account secure. Make sure to add your phone number and email address if you haven't already." I have cleared my internet cache, I have used four different browsers across both my PC and my phone, and I have also tried using the Xfinity App, but I get the same message every time. I would greatly appreciate any assistance with being able to get this resolved.