Are there certain email inputs that PlayFab considers invalid? Some of my users have had issues registering accounts with an email that has a '.' in the username string (Example: 1234.5678@hotmail.com). I have checked my own verification system that I've implemented and it doesn't seem to be causing the issue. I have tested myself and get the "Invalid Input Parameters" returned error.
Currently, the username is required to be alphanumeric (A to Z - upper or lower - and 0-9) and between 3 and 20 characters. It is not the same as Email parameter in the RegisterPlayFabUser API. The email parameter can be general email format.
You can refer to this similar case: Email username and password validation - Playfab Community.
That makes sense - I am generating a username from the email automatically when calling RegisterPlayFabUser, so that would be the cause of the error. Thank you!
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