HTML Confirmation eMail Not Working/Sending

Hi there,

I have Appointments+ up and running. Lovely jubbly!

However, when I activate HTML eMails in the Add-ons and then cut and paste the code from the WPMUDEV HTML Email plugin into the Appointments+ Notifications area ...... no emails are sent. Not so lovely jubbly.

As soon as I revert back to the default text (still leaving the HTML addon turned on), the emails arrive no problem.

This is the kind of email I am trying to send. I would have thought the code from another WPMUDEV plugin would have worked OK. Perhaps I am missing something.

I will grant support access in case a WPMUDEV Support Ninja wants to stop by.

Thanks in advance.
Elliot