chat: markChatUnreadForUser

Namespace: microsoft.graph


APIs under the /beta version in Microsoft Graph are subject to change. Use of these APIs in production applications is not supported. To determine whether an API is available in v1.0, use the Version selector.

Mark a chat as unread for a user.

This API is available in the following national cloud deployments.

Global service US Government L4 US Government L5 (DOD) China operated by 21Vianet


Choose the permission or permissions marked as least privileged for this API. Use a higher privileged permission or permissions only if your app requires it. For details about delegated and application permissions, see Permission types. To learn more about these permissions, see the permissions reference.

Permission type Least privileged permissions Higher privileged permissions
Delegated (work or school account) Chat.ReadWrite Not available.
Delegated (personal Microsoft account) Not supported. Not supported.
Application Not supported. Not supported.

HTTP request

POST /chats/{chat-id}/markChatUnreadForUser

Request headers

Name Description
Authorization Bearer {token}. Required. Learn more about authentication and authorization.
Content-Type application/json. Required.

Request body

In the request body, supply a JSON representation of the parameters.

The following table shows the parameters that can be used with this action.

Parameter Type Description
lastMessageReadDateTime DateTimeOffset Timestamp that indicates the time after which all sent or received messages are to be marked as unread.
user teamworkUserIdentity User to unread the chat for.

Note: lastMessageReadDateTime is optional in the request. If not mentioned, the last message would be marked as unread.


If successful, this action returns a 204 No Content response code.



Content-Type: application/json
Content-length: 158

  "user": {
    "id" : "d864e79f-a516-4d0f-9fee-0eeb4d61fdc2",
    "tenantId": "2a690434-97d9-4eed-83a6-f5f13600199a"
  "lastMessageReadDateTime": "2021-05-27T22:13:01.577Z"


HTTP/1.1 204 No Content