Send of OSC built on iOS does not work.

This is my first forum post. I would like to ask the forum members to please help me.
I am currently working on a game that uses iOS, where two iOS devices are played in sync with OSC.
Despite Receive working, only Send is not working.

The characteristic of this problem is that it works fine on the PC, but occurs when built on an iOS device.
To investigate, I tested with both OSC Client and Server on localhost (127.0.0.1).
There was no problem on PC, but when I built and tested on iOS, I found that it did not work.
Also, when I send OSC from PC to iOS, iOS shows a Receive response, but when I send from iOS to PC, there seems to be no response.

If anyone has any ideas, I would be happy to hear them.
Thanks!

Production Environment,
Developed on Mac, UE5.0.3, Blueprint only, build tested on iPhone6S.

Hey @issss, thanks for posting on the forum.
The only thing that is grabbing my attention is the “X pressed” blueprint before sending, if you’re not pressing X on your device it does not seem like it will fire.

I hope this can help!
-Zen