From my past experience, any app for Android Enterprise enrolled devices (Work Profile or Work Managed) must be uploaded to the managed Google Play Store first before app config values will get pushed to the devices.
FYI I was able to get configurations pushed to an internal app on a Work Profile device
- Install .apk from hosted location via Google Chrome into Work Profile (could not get uploaded .apk to AirWatch deployed on Work Profile device)
- Create profile with Custom Settings profile
<characteristic type="com.airwatch.android.androidwork.app:com.package.id" uuid="38ce1389-0a93-4323-a5aa-4c99b9ef627a">
<parm name="param" value="value1" type="string" />