I think it is still in beta, so not expecting perfection, but it seems like the PG threat modeling course doesn’t work with VPN turned on 
I can’t say whether it is just my VPN, or all VPNs. But for what it is worth, I’m using ProtonVPN.
It appears to be down right now.
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Hmm… It’s not down for me. I’m able to access it, as long as my VPN is turned off.
My NextDNS setup won’t return an address for a brand new domain address record. The reason is that many bad sites (phishing, malware, etc.) use brand new DNS A records.
So, at present, I get a address not found if I try to go there. That will resolve itself in a few days. Or if I can’t wait I can got to my NextDNS control panel and whitelist it.
Does the DNS server on your VPN do the same thing?
I think it is just partially broken on our end, for… some reason. I can run this test with 150 computers around the world and only 40 of them get the correct IP: