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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.
Create a comment activity for a case.
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
POST /security/caseManagement/cases/{caseId}/activities
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 microsoft.graph.security.caseManagement.activity object. To create a comment, include @odata.type with #microsoft.graph.security.caseManagement.comment and the message property. Audit log activities are system generated and can't be created by clients.
You can specify the following properties when creating an activity.
| Property | Type | Description |
|---|---|---|
| @odata.type | String | The OData type of the concrete activity. To create a comment, use #microsoft.graph.security.caseManagement.comment. Required. |
| message | String | The comment body. Required. |
Response
If successful, this method returns a 201 Created response code and a microsoft.graph.security.caseManagement.activity object in the response body.
Examples
Request
The following example shows a request.
POST https://graph.microsoft.com/beta/security/caseManagement/cases/{caseId}/activities
Content-Type: application/json
{
"@odata.type": "#microsoft.graph.security.caseManagement.comment",
"message": "This is a comment for the case."
}
Response
The following example shows the response.
HTTP/1.1 201 Created
Content-Type: application/json
{
"@odata.type": "#microsoft.graph.security.caseManagement.comment",
"id": "d2a408d7-9023-4e99-ac69-2e00b36314eb",
"message": "This is a comment for the case.",
"createdDateTime": "2026-05-20T11:12:28Z",
"createdBy": "user@contoso.com",
"lastModifiedDateTime": "2026-05-20T11:18:45Z",
"lastModifiedBy": "user@contoso.com"
}