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In a web browser on a desktop or laptop, open an Xfinity Connect "Compose" window ( https://connect.xfinity.com/ ). Then:
If you don't have access to a desktop or laptop, you might be able to follow the steps above by using a web browser's "Desktop site" function on a mobile device.
After making this change it may take a while, possibly an hour or more, for the name to appear in the Xfinity Connect app.