Cancel Calendar invitation - Not supported calendar message.ics

Chris P_
Tera Expert

Since we upgraded to Madrid our cancellation iCalendar mails sent don't work anymore.
They show in the mailbox as follows:
find_real_file.png

So further investigation found that this was sent via email:
find_real_file.png 

find_real_file.png

This is exactly the same as before Madrid and it worked like a charm as it showed an email message with the option to remove the meeting from your calendar.

Now obviously I did some testing before running to the community and I found that if I changed this in the email:
find_real_file.png

REQUEST to CANCEL it actually does send a working meeting cancellation!

So how do I manipulate the 'method' used in the email for Calendar invitation (cancellations) before sending them?

 

Cheers Chris