Office 365 Network Onboarding Advanced Tests - "unable to connect back to origin"

[MHoskins]

After running the initial Network Connectivity Test, installed .NET Core 3.1 Desktop Runtime, then ran the “Connectivity.[guid].companyname.com.exe” as administrator and receive the attached error message.

[#2]

Update: running off vpn with direct connection allows the test to run successfully @Paul Andrew can you point me to the URL requirements doc