Self resolved.
We tried it on multiple devices and found that some devices worked without problems and others did not.
It was due to multiple issues.
The problems are listed below.
- The network settings on Windows misunderstood the public network and private network settings, and the range of communication allowed by Windows Firewall was incorrect.
- The installation performed when switchboard was first started did not work correctly and the Python plugin installation failed.
- I was able to resolve this issue in UE5 with switchboard’s dependency reinstallation feature.
- I have not found a solution for UE4.
- Unrelated to this issue, there was a time when I could not install the Unreal Engine from the Epic Game Launcher. A colleague of mine who was installing at the same time was also tripped up by not being able to install, so I decided to use the install server (edge server of CDN?). We believe that there was a problem with the
Thanks to all who helped.