We have sent a registration email to one of our consultants. When he clicks on the link, an error message appears. The error message says, "Error-This request is invalid or has been tampered with."
We've tried sending a new invitation, but got the same result. We've had at least three other people register for the same extranet location.
The user has a Gmail email account and uses a Mac. I don't know if that would make a difference or not, but...