Appointment cancel link in the email not working

We have Appointments+ installed and configured on our site. The site is about to be launched and announced to the public in the next day or two. I was running through all the features of the site to make sure everything is working 100% before the launch.

I discovered that the appointment cancel link in the email sent the the client is not working. When the link is visited in the web browser the person is taken to the homepage and not the custom page I designated in General settings. Also the appointment doesn't cancel.