This client is not using Pi-hole for DNS, it is using OpenDNS.
Only Pi-hole can resolve the name pi.hole, so this is why you cannot load the web admin GUI using the domain name.
Fix the client so it uses Pi-hole for DNS.
This client is not using Pi-hole for DNS, it is using OpenDNS.
Only Pi-hole can resolve the name pi.hole, so this is why you cannot load the web admin GUI using the domain name.
Fix the client so it uses Pi-hole for DNS.