Error 522 on IPv6 only NGINX server

Running a server on Charter/Spectrum internet and trying to get proxy to work with ipv6 only.
curling the origin address gives me a response so I know that is reachable but whenever cloudflare tries to access it it doesn’t show up in the nginx logs and also isn’t blocked by iptables?

My working theory is that spectrum is blocking these requests but idk how to test that.

Maybe try a site that offers “global” http (or ping) tests. I found one Website Availability Test - Check Website Uptime | Uptimia, but you can find many more of these if you search something like “worldwide availability test http”.

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