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You can use the My Account app to modify or change your primary e-mail address, please follow the steps below:
Manage Alternate Email Addresses in the XFINITY My Account App
You can add and edit alternate email addresses in the XFINITY My Account app.
Adding Your Alternate Email Address
Your alternate email address can be viewed and edited in the XFINITY My Account app:
Modifying Your Preferred Email Address
You can set your preferred email address in the XFINITY My Account app:
I hope this helps.