Is it possible to update calendar event properties together with an open data extension in a single PATCH?

Question

I'm wondering whether it's possible to update properties of an open data extension attached to an event and regular properties of this event in one call, using the Graph API. Hopefully someone can shed some light on this.

The documentation of 'Update event' seems to suggest so:

Because the event resource supports extensions, you can use the PATCH operation to add, update, or delete your own app-specific data in custom properties of an extension in an existing event instance.

However, when I'm sending such a request, the extension is not actually created/updated, while the regular event properties are. The request I'm sending:

Request: PATCH /v1.0/me/events/<EVENT_ID>  

Request body:  

{  
    "id": "<EVENT_ID>",  
    "location": {  
        "displayName": "This is the updated value"  
    },  
    "extensions": [  
        {  
            "@odata.type": "microsoft.graph.openTypeExtension",  
            "extensionName": "my.app.id",  
            "testProp": "test"  
        }  
    ]  
}  

But when I retrieve the event again, the location is updated, but it doesn't contain the extension:

Request: GET /me/events/<EVENT_ID>?$expand=extensions($filter=id eq 'my.app.id')  
  
Response body:  

{  
    "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users('<SOME_ID_HERE>')/events(extensions())/$entity",  
    "id": "<EVENT_ID>",  
      
    ...  
      
    "location": {  
        "displayName": "This is the updated value",  
        "locationType": "default",  
        "uniqueId": "This is the updated value",  
        "uniqueIdType": "private"  
    },  
    "locations": [  
        {  
            "displayName": "This is the updated value",  
            "locationType": "default",  
            "uniqueId": "This is the updated value",  
            "uniqueIdType": "private"  
        }  
    ],  
      
    ...  
}  

I thought the old, deprecated Outlook REST API also supported this, but I can't seem to get it to work with the Graph API.

Answer 1

If i am not wrong, you need to first store the item in the store, then make the changes - its the recommended approach. Being said that let me check on this and see if its doable or not.