Multiple Notifications sent When Graph API SDK Patch Sent

[noelrfMcM]

Describe the bug
currently using Microsoft Graph v 5.3.0. I have a web service written in .net core 6.0
to update Events in outlook by adding an attendee or removing it as required. I am also forwarding events to other emails.
The attendee is a room location resource email which is set to auto accept if free and auto decline if busy.

The trigger is a room booking system database change so we know the attendee to add then run the code.

The code is very much as per Microsoft example:

var graphClient = initialiseGraphClient(tenantId, clientId, secretName, keyVaultName, keyVaultURL);

            var requestBody = new Event
            {
                Recurrence = null,
                Attendees = attendees,
                Location = location,
                Locations = locations
            };

            var resultEvent = await graphClient
               .Users[userEmail]
               .Events[eventId]
               .PatchAsync(requestBody);

When I do a patch to update the attendee list (remove or add an attendee), notifications are not only sent to the host but also
all the attendees. In some cases this can be 3 notifications at once with the same status of the new attendee has accepted.

To Reproduce
Steps to reproduce the behavior:

1. Create room booking, change is detected in the database by the web service
2. Run the code as shown adding in the attendees plus the new attendee.
3. wait in outlook for notifications which appear.

Expected behavior
Only one notification should be sent.

Screenshots
If applicable, add screenshots to help explain your problem.

Server:

• OS: Web service sits on a windows 2012 server

[andrueastman]

Thanks for raising this @noelrfMcM

According to the documentation, you want only to have the attendees property in the request payload for this to work as you wish. https://learn.microsoft.com/en-us/graph/api/event-update?view=graph-rest-1.0&tabs=http#notes-for-updating-specific-properties

Any chance you get a different result if you set the body as below to only update the specfied property?

var requestBody = new Event
{
    Attendees = attendees
};

[noelrfMcM]

Eastman, Thanks for coming back to me. I will check if just adding the attendees makes a difference regarding the notifications. I'll let you know if that makes a difference. Thanks Noel From: Eastman ***@***.***> Sent: Thursday, July 6, 2023 10:25 AM To: microsoftgraph/msgraph-sdk-dotnet ***@***.***> Cc: Noel McMahon ***@***.***>; Mention ***@***.***> Subject: Re: [microsoftgraph/msgraph-sdk-dotnet] Multiple Notifications sent When Graph API SDK Patch Sent (Issue #1996) WARNING: External Email Thanks for raising this @noelrfMcM<https://github.com/noelrfMcM> According to the documentation, you want only to have the attendees property in the request payload for this to work as you wish. https://learn.microsoft.com/en-us/graph/api/event-update?view=graph-rest-1.0&tabs=http#notes-for-updating-specific-properties Any chance you get a different result if you set the body as below to only update the specfied property? var requestBody = new Event { Attendees = attendees }; — Reply to this email directly, view it on GitHub<#1996 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/BBARLIPJPMCJKECTUUR5AYDXOZ763ANCNFSM6AAAAAAZ4LRM54>. You are receiving this because you were mentioned.Message ID: ***@***.******@***.***>>

[ghost]

This issue has been automatically marked as stale because it has been marked as requiring author feedback but has not had any activity for 4 days. It will be closed if no further activity occurs within 3 days of this comment.

[microsoft-github-policy-service]

This issue has been automatically marked as stale because it has been marked as requiring author feedback but has not had any activity for 4 days. It will be closed if no further activity occurs within 3 days of this comment.

[microsoft-github-policy-service]

This issue has been automatically marked as stale because it has been marked as requiring author feedback but has not had any activity for 4 days. It will be closed if no further activity occurs within 3 days of this comment.

[ssougnez]

Thanks for raising this @noelrfMcM

According to the documentation, you want only to have the attendees property in the request payload for this to work as you wish. https://learn.microsoft.com/en-us/graph/api/event-update?view=graph-rest-1.0&tabs=http#notes-for-updating-specific-properties

Any chance you get a different result if you set the body as below to only update the specfied property?

var requestBody = new Event
{
    Attendees = attendees
};

I had the same issue and I can confirm that this works.