It fails since the username field of the PHYLO game doesn't allow you to enter underscores.
The PHYLO game's username input field should allow all the characters that the OpenPhylo registration allows.
This is especially true of underscore characters, since the Phylo web game is already using underscores in the guest user account names (ex. "guest_HJBIkp").
If a user registers a new account in the OpenPhylo UI, they won't be able to log into the PHYLO web game if the username contains special characters.
Steps to reproduce:
It fails since the username field of the PHYLO game doesn't allow you to enter underscores.
The PHYLO game's username input field should allow all the characters that the OpenPhylo registration allows.
This is especially true of underscore characters, since the Phylo web game is already using underscores in the guest user account names (ex. "guest_HJBIkp").
Tested with PHYLO Web v2.0.1