I am using a webhook to publish events to an Azure Event Grid Topic whenever an action is updated. But when I use the access key from the topic to authenticate the request, I see error like

[![Error](https://i.stack.imgur.com/xhOjb.png)](https://i.stack.imgur.com/xhOjb.png)

What am I doing wrong?

[Reference for Azure docs](https://learn.microsoft.com/en-us/azure/event-grid/security-authenticate-publishing-clients)