It seems like the first name and last name is not being fetched for Apple Sign-In even if the name scope has been specified. I tried looking at the code it mentioned:

Since CompleteUserAuth has access to the request, I was thinking that fetching the names should be possible, though there would be a change on the method signature of FetchUser.

Just wondering if the omission was more of a limitation or was this intentional? If it's a limitation with the current implementation I'd like to take a stab at implementing this.