How To Change or Find Your Xfinity ID — My Account Help
https://www.xfinity.com/support/articles/how-to-change-your-username
In the Xfinity ID & Password section, click Edit to the right of the current Username. Confirm the password and enter the new Xfinity ID in the New Username box, then click Save. Note: If you are changing the Xfinity ID for another user on your account, you’ll need to enter their password, not your own. This will also change the @comcast.net email.
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