Hello Ali,

Thank you for reaching out to us.

We have encountered a couple of instances of this issue where the issue was that there was a space before the "%appointment_cancel_url%" placeholder (Screenshot attached). Please check if that is the case in your instance.

If not, please provide me a temporary WP-admin (administrator) user for your site where this happens, so we could log in and take a look ‘from the inside’ as that’s the most efficient way to see and resolve the issue. 

We do not interfere with any data or anything else except for the plugin (in case that’s a production version of the site), and of course, we do not provide login data to third parties. 

You can write credentials here just check PRIVATE Reply so nobody can see them except us.

Hello Ali,

I have tested this from my side, booked an appointment, received an email and cancelled it successfully (Screenshots attached).