@Mike welcome to the Microsoft Q&A community.
From your message, it seems like you're trying to configure a webhook in Azure Update Manager to send the hostname of a device during pre-maintenance. Below options can help you.:
- Microsoft Q&A has a discussion on webhook delivery properties related to device hostnames. You might find relevant insights here.
- Geek XING provides a guide on setting up pre and post-maintenance events using Azure Functions, which could be useful for automating tasks like sending hostnames before updates. Check it out here.
- Microsoft Community Hub outlines a systematic approach to leveraging Azure Update Manager with pre and post events, including setting up webhooks for runbooks. You can explore it here.
I hope these helps. Let me know if you have any further questions or need additional assistance.
Also if these answers your query, do click the "Upvote" and click "Accept the answer" of which might be beneficial to other community members reading this thread.