I think they don't mean UTF-8, since they said ASCII. But I agree that they probably did mean something like "if your legal name cannot be written in ASCII and

I think they don't mean UTF-8, since they said ASCII. But I agree that they probably did mean something like "if your legal name cannot be written in ASCII and there is some standard way for it to be transliterated to ASCII use the transliteration instead of your legal name", or at least that's what I assumed they meant and filled out the subject line accordingly.