firewall – What needs unblocking to allow access to Windows Store/Feedback Hub

I have a domain joined machine that whilst on our company VPN, I am unable to access app pages within the Windows Store, and unable to load feedback in the feedback hub. I can access all of these fine whilst not on the VPN.

Does anyone know what the endpoints for either of these apps are, so I can look to add exceptions to our web filtering service and firewall, to allow me to access these whilst on our VPN?