Exposing sse endpoints in API Management from Azure Functions

I'm trying to connect my mcptooltrigger functions in Azure Functions with my API Management Service.   I was wondering if there is guidance for which policies need to be in place to support SSE and the endpoints we have to allow for (/sse and /messages) in the API Management service.  I've updated the policies for what I can read online, but can't get it to work (https://learn.microsoft.com/en-us/azure/api-management/how-to-server-sent-events)

I also overrode the x-functions-key to use the mcp_extension key and I don't get a 401 message, I just get a hanging response.

Without API Management, I can get Visual Studio Code to connect to the sse endpoint with the Azure Functions endpoint.