Can't access some emails after canceling cable TV service at the end of April

I canceled my Comcast cable TV service at the end of April.  I accessed all of them in the days prior to service end via the website and sent/received/replied to emails.

Last week, I began having access issues with said email via Thunderbird, which is where I always check my emails.

I went to the Xfinity website and tried accessing some of these accounts.

After logging in and going to "Account and identity," my Primary account reads as: 

"This account is no longer active. Users cannot be added."  That's fine, as I just want access to my emails.

Navigating to "Xfinity ID and security," I get the error: 

"A rendering error occurred: Cannot read properties of undefined (reading 'trim')."

To be clear, I still have access to -most- of my frequently-used accounts accessed on Thunderbird.  If I try to access these lesser-used accounts via the Xfinity website, I get errors.  I've tried accessing these on both Firefox and Edge.

Most of these accounts throw the password reset function:

"Reset your Xfinity password
As part of our commitment to you, Comcast routinely reviews and monitors account security. Please update your password to help protect you and your account."

I click the "Reset password" button.  A new page reads:

"Connect to your home WiFi to reset your password

You'll need to connect to your home WiFi, then navigate to xfinity.com/password to complete a password reset.

Note: Video-only users will need assistance from the primary account holder to reset their password. Get password help"

This is not helpful at all, as I use a wired internet connection and going to xfinity.com/password sends me in another loop.

Any help on regaining account access would be appreciated.