Azure Event Grid: Not able to publish message to Namespace topic with aeg-sas-key header

Question

Azure Event Grid: Not able to publish message to Namespace topic with aeg-sas-key header

Jeevanjyot Kaur 0

I am publishing a message to an Azure Event Grid Namespace Topic using the REST API with aeg-sas-key authentication. However, I am encountering the following error during the publish request.

{
    "error": {
        "code": "Unauthenticated",
        "message": "SAS Key or SAS Signature must be provided",
        "timestamp_utc": "2025-11-05T21:10:18.935050584+00:00",
        "tracking_id": "146AC7EA<***removed PII***>"
    }
}

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Answer 1

Hello Jeevanjyot Kaur,
Include the SAS Key in the Header

- The header should look like:
```
     aeg-sas-key: <your-SAS-key>
```
- This key is generated from the Event Grid Namespace Topic in the Azure portal or via CLI.
Verify the Header Name
- It must be exactly aeg-sas-key (case-sensitive).
- If you are using a SAS token instead of a key, the header should be:
```
     aeg-sas-token: <your-SAS-token>
```

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Azure Event Grid: Not able to publish message to Namespace topic with aeg-sas-key header

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