Hello Alan Richards,
Greetings and Welcome to Microsoft Q&A! Thanks for posting the question.
I understand that you are encountering a 404 error while setting up your AI Service content safety instance in Copilot Studio, here are a few steps to troubleshoot the issue:
- Ensure the API version used in your requests matches the version supported by your Content Safety resource.
- Check region compatibility to confirm that your resource is deployed in a region supported by both Content Safety and your application.
- Review the endpoint configuration, making sure the URL, keys, and headers are correct as per the details in your Azure portal.
- Confirm the resource availability by ensuring the Content Safety instance is active and fully set up in your Azure subscription.
Kindly refer this document, Azure AI Content Safety error codes.
I Hope this helps. Do let me know if you have any further queries.
Thank you!