Create Outlook event and prevent forwarding - microsoft-graph-api

Question

I want to create calendar (outlook) events via the microsoft graph api and set some specific response options.
In the (windows) Outlook client I am able to enable/disable
Request Response
Allow new Time Proposals
Allow Forwarding
In the documentation I can only find properties to enable/disable "Request Response" https://learn.microsoft.com/en-us/graph/api/user-post-events? but not the later ones.
The question is how to enable/disable Time Proposals and Forwarding?
I tried setting the sensitivity to "personal", "private" and "confidential" but it didn't help.

Answer 1

You can do that through the extended property DoNotForward. This has the following property definition:
PropertySet: 00020329-0000-0000-C000-000000000046
Name: DoNotForward
Type: Boolean
Here is an example I wrote for this.
Allow time proposal is:
PropertySet:00062002-0000-0000-C000-000000000046
Name: AppointmentNotAllowPropose
Type: Boolean
Using the ms-graph-sdk for dotnet the following code works:
var e = new Event()
{
Subject = "subject",
Start = new DateTimeTimeZone()
{
DateTime = dateTimeTimestamp1,
TimeZone = "Europe/Berlin"
},
End = new DateTimeTimeZone()
{
DateTime = dateTimeTimestamp2,
TimeZone = "Europe/Berlin"
},
SingleValueExtendedProperties = new EventSingleValueExtendedPropertiesCollectionPage()
{
new SingleValueLegacyExtendedProperty
{
Id = "Boolean {00020329-0000-0000-C000-000000000046} Name DoNotForward",
Value = "true"
},
new SingleValueLegacyExtendedProperty
{
Id = "Boolean {00062002-0000-0000-C000-000000000046} Id 0x825A",
Value = "true"
}
}
};
The AppointmentNotAllowPropose is referenced here by id, as setting the value by it's name somehow does not have an effect.