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Namespace: microsoft.graph.security.caseManagement
Important
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.
Update a comment activity in a case timeline. Only comment activities support update. Include @odata.type with #microsoft.graph.security.caseManagement.comment in the request body to identify the concrete activity type.
Important
You can't use this API to update comment activities for incidentCase objects.
Permissions
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 permission | Higher privileged permissions |
|---|---|---|
| Delegated (work or school account) | Not supported. | Not supported. |
| Delegated (personal Microsoft account) | Not supported. | Not supported. |
| Application | Not supported. | Not supported. |
Important
For delegated access using work or school accounts, the signed-in user must be assigned a supported Microsoft Entra role or a custom role that grants the permissions required for this operation. This API supports the following built-in roles:
- Security Reader
- Security Operator
- Security Administrator
HTTP request
PATCH /security/caseManagement/cases/{caseId}/activities/{activityId}
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 only the values for properties to update. Existing properties that aren't included in the request body maintain their previous values or are recalculated based on changes to other property values.
The following table specifies the properties that can be updated.
Supply a JSON representation of the resource. Include @odata.type to identify the concrete activity type.
| Property | Type | Description |
|---|---|---|
| @odata.type | String | The OData type of the concrete activity. To update a comment, use #microsoft.graph.security.caseManagement.comment. |
| message | String | The comment body. |
Response
If successful, this method returns a 200 OK response code and an updated microsoft.graph.security.caseManagement.activity object in the response body.
Examples
Request
The following example shows a request.
PATCH https://graph.microsoft.com/beta/security/caseManagement/cases/987757fb-6ef4-1061-17e7-9de0d088e1dd/activities/c5dcf8b0-0732-750b-0e35-7f44188423bf
Content-Type: application/json
{
"@odata.type": "#microsoft.graph.security.caseManagement.comment",
"message": "This is a modified comment."
}
Response
The following example shows the response.
HTTP/1.1 200 OK
Content-Type: application/json
{
"@odata.type": "#microsoft.graph.security.caseManagement.comment",
"id": "c5dcf8b0-0732-750b-0e35-7f44188423bf",
"createdDateTime": "2026-05-20T11:12:28Z",
"createdBy": "user@contoso.com",
"lastModifiedDateTime": "2026-05-20T11:18:45Z",
"lastModifiedBy": "user@contoso.com",
"message": "This is a modified comment."
}