Appointments + won't let me cancel via email link

Hi there,

I can't seen to cancel Appointments that have been booked. I added in the CANCEL shortcode which appeared no problem in the confirmation message and Allow client cancel own appointments is set to YES, but when i click the link it takes me to the home page (which it won't let me change from the General settings) and the Appointment never gets cancelled. The only way I can do it manually is from the backend by removing it. Can you help determine why the email links won't cancel appointments anymore??

Thank you for your help!