Sorry you’re having trouble. I assume the iPad is on the same wifi as the iphone and unraid? It should just work. After you tell the ipad to join, and press on the network ID, it should open a details screen. What does that say after a minute or two?
Tried it again now I’m on my home network and got the iPad working now. Probably the other WiFi I tried before was dodgy, was on the road, OTR driver, the iPhone worked then but not the iPad and both were on the same network.
But thanks for your reply, now I can start learning ZeroTier config.