Event Grid with local Webhook Endpoint

Question

I am trying to create an Event for a storage account. The Event should send a notification to one of my Azure VM's. I Chose the eventtype Webhook for doing this. When I try to Access my VM via the public IP, this works out, I receive Data. But when I try to reach the pricate IP (in this case the 10.0.0.7:1001) I do not get any data. The Port is open (i do see data send from other devices in my vnet) but this particular Connection isn't working.

Is there any Option to make this work. Or another way to establish such an Connection?

PS: Using the public IP is not an Option due to security concerns.