Why the Blueprint nodes "FindSessions" and "CreateSession" fail immediatly on iOS?

Development Programming & Scripting Blueprint
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Hello everyone,I am trying to make a LAN game on iOS. Everything is OK in PIE mode,but when I packaged and installed it to my device(iphone 6s with a developer certificate) ,and hit the “find matches” or “host a game” button, the node “FindSessions” or “CreateSession” failed in no time. I had put [OnlineSubsystem] DefaultPlatformService=IOS in IOSEngine.ini
Waiting for help,thank you!

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Did you manage to fix this?

3

I have same problem, anyone know how to fix it?

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I have this too, anyone found an answer?