This might seem weird, but I installed a regular Android app using ADB to my Huawei Watch 2 and the app requires notification access which when attempting in app causes it to crash as it trys to open the settings to allow it's access which doesn't exist in the settings.
I just need to grant this one permission in order to get the app to work
For Android 9 or above use this:
adb shell cmd notification allow_listener com.mypackage.app/com.mypackage.app.mylistener
For any other Android version below 9 use this:
adb shell settings put secure enabled_notification_listeners %nlisteners: com.example.myapplication/com.example.myapplication.service.ServiceNotificationIntercept
adb shell into your device and do
cmd appops set package.name PERMISSION_NAME {allow/ignore}
Edit: I don' think this will work with notification access. Anyway, the command for changing system settings is
adb shell settings put setting_name value
But I cannot find any setting name corresponding to notification access. You can take a look all the available settings here
Other alternative if you are rooted is to extract the settings.db where all the preferences are store, modify it there using sqlite and reboot.
