Troubleshooting iOS Apps
If your app fails to install, or fails to run, try taking the same exact app bundle you uploaded and run it locally on the iOS Simulator directly.
You can try this by taking the same .zip file you uploaded to ObservePoint, unzipping it to get the .app bundle, and then installing it onto a running iOS Simulator with the command:
xcrun simctl install booted <your bundle name>.app/
Even if that works, you might also try doing the same on another developer's machine. Sometimes the .app bundle includes references to local files that were not properly added to the bundle, so it will work on the same developer's machine, but not another.