event: tentativelyAccept

Namespace: microsoft.graph

Tentatively accept the specified event in a user calendar.

If the event allows proposals for new times, on responding tentative to the event, an invitee can choose to suggest an alternative time by including the proposedNewTime parameter. For more information on how to propose a time, and how to receive and accept a new time proposal, see Propose new meeting times.

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) Calendars.ReadWrite Not available.
Delegated (personal Microsoft account) Calendars.ReadWrite Not available.
Application Calendars.ReadWrite Not available.

HTTP request

POST /me/events/{id}/tentativelyAccept
POST /users/{id | userPrincipalName}/events/{id}/tentativelyAccept

POST /me/calendar/events/{id}/tentativelyAccept
POST /users/{id | userPrincipalName}/calendar/events/{id}/tentativelyAccept

POST /me/calendars/{id}/events/{id}/tentativelyAccept
POST /users/{id | userPrincipalName}/calendars/{id}/events/{id}/tentativelyAccept

POST /me/calendarGroups/{id}/calendars/{id}/events/{id}/tentativelyAccept
POST /users/{id | userPrincipalName}/calendarGroups/{id}/calendars/{id}/events/{id}/tentativelyAccept

Request headers

Name Type Description
Authorization string Bearer {token}. Required.
Content-Type string Nature of the data in the body of an entity. Required.

Request body

In the request body, provide a JSON object with the following parameters.

Parameter Type Description
comment String Text included in the response. Optional.
proposedNewTime timeSlot An alternate date/time proposed by an invitee for a meeting request to start and end. Valid only for events that allow new time proposals. Setting this parameter requires setting sendResponse to true. Optional.
sendResponse Boolean true if a response is to be sent to the organizer; otherwise, false. Optional. Default is true.


If successful, this method returns 202 Accepted response code. It doesn't return anything in the response body.

This action returns HTTP 400 if one or both of the following occur:

  • The proposedNewTime parameter is included but the allowNewTimeProposals property of the event is false.
  • The proposedNewTime parameter is included but the sendResponse parameter is set to false.


Here is an example of how to call this API.


In the following example, the signed-in user responds tentative to the specified event, sets the sendResponse parameter to true, and includes an alternative time in the proposedNewTime parameter.

POST https://graph.microsoft.com/v1.0/me/events/{id}/tentativelyAccept
Content-type: application/json

  "comment": "I may not be able to make this week. How about next week?",
  "sendResponse": true,
  "proposedNewTime": {
      "start": { 
          "dateTime": "2019-12-02T18:00:00", 
          "timeZone": "Pacific Standard Time" 
      "end": { 
          "dateTime": "2019-12-02T19:00:00", 
          "timeZone": "Pacific Standard Time" 


Here is an example of the response.

HTTP/1.1 202 Accepted