error message in email confirmation from Membership 2 Pro

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.