Hello, I’m new to S2 Member (free version) and in the process of setting up. I get as far as Registering and it works fine for me because I am signed in as the Admin. A new user tries to register and no matter what username they pick it comes back with:
“Error: This username is invalid because it uses illegal characters. Please enter a valid username”
I could not find an exact match searching for answers here and Google has an array of solutions pointing to several solutions depending on the Theme or editing code in WordPress. Everything I have installed is up to date. Appreciate any help. Thank you.