DNS_PROBE_FINISHED_NXDOMAIN on iPhone
Why it happens on iPhone
iCloud Private Relay and VPN profiles route DNS through Apple's resolver, which returns NXDOMAIN for internal or newly registered names the public internet cannot see yet.
The fix on iPhone
Settings → Apple Account → iCloud → Private Relay: turn it off temporarily and reload. For a domain registered in the last hour, propagation is the answer — the lookup below shows whether any resolver has the record.
Is DNS_PROBE_FINISHED_NXDOMAIN happening on your domain?
The DNS lookup queries public resolvers directly and shows the A, AAAA, CNAME and NS records that actually exist — which instantly separates 'record missing' from 'my resolver is stale'.
Free, no signup. Runs from outside your network, which is the only way to tell a server fault from a local one.
If that didn't fix it
iPhone has its own failure mode, but DNS_PROBE_FINISHED_NXDOMAIN has a wider set of causes that apply everywhere. The most common one overall is: the a or cname record for the hostname does not exist.
All causes and fixes for DNS_PROBE_FINISHED_NXDOMAIN