Unable to create user on Membership2, create user button disabled

Hello,

All of the sudden I am not able to create new users on the Membership2 plugin. It was working fine when I first installed it, but now when I went back to add more users, it won’t let me. The create user button is disabled and when I try to add a user from an existing wordpress user, it won’t let me. Do you have any idea why this would be happening? I have everything up to date, deactivated all plugins and changed to a default theme but no luck fixing the problem. Thank you in advance!