I would like to set shared extended properties on a calendar event for which I am a guest and guestCanModify is enabled.

So far I have only been able to do so if I am also subscribed to the organizer’s calendar.

Is there a way to patch the calendar event with new shared properties even if I am not subscribed to the organizer’s calendar?

When trying to patch an event as a guest with guestCanModify = true and I am not subscribed to that calendar, I get a 403 error.

I used as the calendarId my guestId as well as the organizersId, but as mentioned this only works when I use the organizersId and only if I am subscribed.

Can I somehow use the CalUID to directly patch the calenderEvent ressource without going through the organizers calendar?

Any help is much appreciated!