Registration in the community is always done via confirmation email, in which you have to click on the activation link. Errors can occur in some email programs as they cannot forward you via this link.
When problems with the registration occur, please contact us.
When in doubt check if you can already log into the community as the activation might have already been successful. The activation link only works once. If the activation has already been successful, the link automatically becomes invalid and you can log in with your email address and your password.