Modifying User Table

New to Filament...How can I modify the user table? For example, I changed the migration to use "first_name" and "last_name" instead of "name". I extended the MakeFIlamentUser command to add the needed fields and that works fine. However, I get Filament\FilamentManager::getUserName(): Return value must be of type string, null returned when the page loads. Googling makes me think literally no one has had this requirement before, which I find odd. I found only one question posted and the person said they solved it by changing it back to "name". Surely I'm missing something..
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