Are you saying that it’s not working for things that have static leases, but are for dynamic? How are they being assigned? Do you have them set statically from the dhcp server, or from the end device? If it’s assigned on the end device, then I don’t think pihole ever picks up the hostname since that would have been sent in the dhcp discovery, and if it’s static on the end device, it won’t ever issue a dhcp discovery message. So it would need to be manually added to your local DNS if it’s assigned static on the device