Those instructions look good, but they are geared towards a production build of the app.
It looks like you are trying to run the app in Expo Go. This will not work, because Expo Go does not have the native code from the uxcam SDK built into it.
You should create a development build and use that instead of Expo Go.
Basically:
eas build -p android --profile development
eas build -p ios --profile development