When using the Graph API to add or update a calendar permission, it would be massively helpful it we could suppress the sending of an email from the user's mailbox when it completes.
e.g. when doing a POST against https://graph.microsoft.com/v1.0/me/calendar/calendarPermissions with a json packet of permission object we want added (as described here) the permissions work just great, but an email also gets sent to the trustee email address from the owners mailbox.
When this happens if the permission is for access by a group that happens to be moderated there is no way of stopping these emails with a transport rule. And if the owner is not allowed to email the trustee address (but the trustee is meant to be able to see the owner's calendar) the owner will get a failure notification.