I connect my iPhone XR with UE4 for metahuman and after that I see green light but after 5 seconds it became yellow. Animation at metahuman is not online but freezing at one frame. After that green light shows for 1 sec very rear.
I installed ARKit, livelink plugin and everything what written at documentation. Plus green shows when I change timecode. Internet speed is 1000/1000
Just wanted to say thank you, I had this same problem. I had an additional, old IP address listed as a target in the app. Removing the old one from the app settings cleared it up.
I also wanted to say a big thank you for answering this question. I had recently upgraded my WiFi to a Mesh, and upgrading to this Mesh had changed my IPv4 address. So I naturally just typed that new IPv4 address in my iPhone app, and the above began happening.
So I deleted all the old ones, even an address from an old computer I was testing Live Link with that was still in my Live Link iPhone app settings, and voila! It began working like a charm instantly.