I sent a Campaign email to 56 customers and several got back to me and said that when they clicked on the "CLICK HERE TO JOIN", nothing happened and I have not received anything telling me which of my customers want to join.
Thank you for reaching out to the Community! Can you please reply back with the title of the email so we can take a look? Also, where is this link located in the email? It does sound like you need to link it still to a sign up form.