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You can use following code from SO's thread:https://stackoverflow.com/questions/69645770/how-do-i-update-a-users-display-name-in-firebase-in-xamarin
var firebaseUserInfo = FirebaseAuth.Instance.CurrentUser;
UserProfileChangeRequest profileUpdates = new UserProfileChangeRequest.Builder().SetDisplayName(username).Build();
await firebaseUserInfo.UpdateProfileAsync(profileUpdates);
Best Regards,
Leon Lu
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