Apple TV
is the username an email address? Can I change it? I don’t see how to “see” my username
4200X,
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The ‘name’ of the Apple ID account is its email address. It is possible to change the associated email address, if needed. Change your Apple ID - Apple Support
Accounts do not have a personal username, although some Apple devices that allow for more than one user (Mac, Apple TV box), can have a usernames that differ from real name or Apple ID account name, limited to each device.
I don’t think custom usernames are used in the Apple TV app on third party devices; not in any of the screenshots that I have seen. You may suggest such a feature for future versions of the app. Feedback - Apple TV App - Apple. I can see how that would benefit e.g. quick account switching,