HTTP3 not caching

Is anyone able to see why HTTP3 is not caching for https://seoace.com.au. I have the same cache rules as other domains which are working?

I’ve checked the headers and my other sites say the server is “cloudflare” but this site says the server is “nginx”

The DNS record for seoace.com.au is not proxied, requests are going direct to your origin and not through Cloudflare.
https://cf.sjr.org.uk/tools/check?c3e88b16b692441ebf6cc8e903d11bf4#dns

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I had to turn that off for email deliverability otherwise PTR would fail. Any workarounds?

Your SPF record already contains the IP address of your mail subdomain and server so you shouldn’t have email deliverability issues. Ensure your mail server presents itself as mail.seoace.com.au as that resolves to your server.

If you don’t proxy the DNS record, requests don’t pass through Cloudflare so there’s no way Cloudflare caching can work.