Here is a possible workaround.
1. Open the configuration details in Headwind MDM web console, and make sure "Permissions for other apps" is set as "Auto-grant all permissions". Adjust the setting and save the configuration if required.
2. Uninstall the app on the device, and refresh the Headwind MDM configuration on the device. Make sure the application was installed by Headwind MDM.
If you're experiencing this issue on Samsung Knox devices,
logcat may help you find a solution.
Uninstall the app, then turn on logcat collecting, and install the app back via Headwind MDM. Make sure logcat contains records tagged by HeadwindMDM. (there should be records like "Permission ... granted to package your.app.package").