pixel streaming not work on ipad over local network

Development Platform & Builds
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Hello, everyone:
i’m using the Pixel Streaming feature on UE 4.24, completely followed the official tutorial Getting Started with Pixel Streaming

but:

  1. it’s not work on my ipad pro(version 12.3.1), tried with safari and chrome, it shows: “WebRTC connected, waiting for video”
    then nothing happens…
  2. also tried with my iphone x, same problem…
  3. while at the same time, both win10 laptop and android phone works well…

is there any special settings while using ipad?