Hello developers of PlayFab and everyone else,
there are some letters like Ä, Ö, Ü or even hyphen: - are invalid for usernames. But Ä, Ö and Ü are very common letters in German, but also in Turkish and other languages. And I can't use them when I want to use them in a username, I get the PlayFabError: InvalidParams. I would suggest to change that and enable as many letters as possible.
