That’s right, the white list option does not help in this scenario.
So when you enable parental control, with “block literal IP addresses” and “block proxy,VPN, TOR” off, you can play in solo mode but not with others. In this scenario, when you run the Xbox network test, it reports “closed NAT”.
When you turn off parental control, you can play with others. In this scenario, when you run the Xbox network test, it reports “open NAT”.
Is the above accurate?
BTW, you might want to try enabling UPnP and see if that helps. Thanks!