I installed this plugin and I'm testing it out. So I logged out of my admin account on Wordpress and went to the site in a different browser. I created my account and received the email confirmation link. All good so far. I clicked on the link in my email, which was:
and the page it returned says "invalid code. check your email or try again." See attached screenshot. So basically the user can't create their account....
I'm on a Mac, and I've tried Firefox and Chrome and Safari browsers.