Need help with transferring secondary email address to another Comcast account

Hello. I saw a similar problem (moving secondary email from one account to another) solved by @ComcastJoeTru in this thread:  https://forums.xfinity.com/t5/Email-Web-Browsing/Transfer-secondary-email-address-to-another-Comcast-account/m-p/3340412

I am also looking for help to move secondary username between two of my accounts.

Thank you!