I'm looking to see if there's any currently built in method to enforce certain restrictions on a player's username. There have been considerations to having clients include their own restrictions but this will not prevent hacked clients from bypassing them.
Some restrictions that I would be looking for include setting a maximum character limit smaller than the current restriction of 25, and limiting what characters can be used (limiting to lowercase alphanumeric characters, for example).
Are there currently any PlayFab tools that exist for this?