DotNet code on promise using proxy to use Azure Apps Insight

Question

Hi,
we have an apps developed in dotnet and want to monitor it with Azure Apps Insigth.

If we set the HTTP_PROXY and APPINSIGHTS_INSTRUMENTATIONKEY it works. But then all the Web call are redirect to the proxy and we have also internal call.

We have try the following:
https://learn.microsoft.com/en-us/dotnet/framework/configure-apps/file-schema/network/defaultproxy-element-network-settings

but seems not working. We see nothing in Azure Apps Isnight.

Any tip, info ?

thanks
Regards,