Delete rsvp option of suggesting new meeting time from created ics file

Question

How do I delete the rsvp option of suggesting a new meeting time as you can see in the screenshot?

Deleting the ;mailto:[email protected] part does exactly that, so that only the three usual rsvp buttons are left, but I also don't receive any rsvp mails any more.

BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//xy.com//Appointment v1.0//DE
METHOD:REQUEST
BEGIN:VEVENT
UID:[email protected]
SEQUENCE:0
DTSTAMP:20240311T080000
DTSTART:20240311T140000Z
DTEND:20240311T143000Z
ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEED-ACTION;RSVP=TRUE;mailto:[email protected]
ORGANIZER;CN="userxy":MAILTO:[email protected]
LOCATION:earth
DESCRIPTION:Hello,\n\nGreetings.
SUMMARY:Meeting on earth
CLASS:PRIVATE
STATUS:CONFIRMED
TRANSP:TRANSPARENT
END:VEVENT
END:VCALENDAR

I am thankful for any suggestions.

Answer 1

You need to set X-MICROSOFT-DISALLOW-COUNTER ICS header to TRUE:

X-MICROSOFT-DONOTFORWARDMEETING:FALSE
X-MICROSOFT-DISALLOW-COUNTER:TRUE
X-MICROSOFT-REQUESTEDATTENDANCEMODE:DEFAULT
X-MICROSOFT-ISRESPONSEREQUESTED:TRUE