Get a list of joined participants during a regular meeting

Octavie van Haaften
You can subscribe for change notification for online meetings. You can get the below event notification:

CallStarted - Occurs when the meeting call has started.
CallEnded - Occurs when the meeting call has ended.
CallRosterUpdate - Occurs when a participant joins or exits the meeting call.

In CallRosterUpdate you will get the active participants joined and exited list.

Example of Response

{
"@odata.type":"#Microsoft.Graph.onlineMeeting",
"@odata.id":"communications/onlineMeetings?$filter=joinWebUrl+eq+'{joinWebUrl}'",
"id":"communications/onlineMeetings?$filter=joinWebUrl+eq+'{joinWebUrl}'",
"eventType":"Microsoft.Communication.CallRosterUpdate",
"eventDateTime":"2022-02-28T00:00:00.0000000Z",
"activeParticipants@joined": [
{
"Id": "a4d67b60-56a5-4202-9f1c-f123ff40621e",
"Identity":
{
"User":
{
"Id": "f92ca67f-0564-414b-8caa-8c95b8099928",
"DisplayName": "user display name",
"TenantId": "85045508-f5bd-405e-a553-52700f86e29c"
}
}
}
],
"activeParticipants@exited": [
{
"Id": "11141402-1b62-4795-b540-4ffee8544231",
"Identity":
{
"AzureCommunicationServicesUser":
{
"AzureCommunicationServicesResourceId": "534c244d-49f8-47a1-9e8e-70d115a2ef4d",
"Id": "8:acs:534c244d-49f8-47a1-9e8e-70d115a2ef4d_28f01a7b-42cd-4e37-ae1a-bd653377f4b7",
"DisplayName": "acs user display name"
}
}
}
]
}

Ref Doc: https://learn.microsoft.com/en-us/graph/changenotifications-for-onlinemeeting

Please note this is supported only beta at this time.

For displaying data on sidepanel please refer below sample:
https://github.com/OfficeDev/Microsoft-Teams-Samples/tree/main/samples/meetings-sidepanel

Thanks, 

Nivedipa

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