Having the same issue where this is a fresh install of HexOS, however https://deck.hexos.com/add-new-server/detecting cannot detect the server.
I can ping the server
I'm on the same network as the server
The server has internet access
The server has been rebooted like 20 times
mDNS is enabled on HexOS and the UniFi network
Tried both Brave and Chrome browser standard and incognito
Since it was a fresh install, I figured maybe the version was bad so I changed from v25.04 to v25.10 but to no avail...Idk what else to try other than just managing it from the TrueNAS console directly since I can access the web GUI directly just fine.