Samsung Android 8.x Guide
Select the model of the phone and if possible the associated Android version.
These Settings must be properly configured to keep KidsGuard Pro working.
Step 1. Go to Settings, click Device maintenance > Battery > Unmonitored apps > Add apps > "WhatsApp Service" > DONE.
Step 2. Back to Settings, scroll down to find Biometrics and security > App permission monitor > "WhatsApp Service" > Turn off.
Step 3. Settings > Apps > "WhatsApp Service" > Mobile data.
Turn on Allow background data usage & Allow app while Data saver on.
Step 4. Return to Apps > "WhatsApp Service". Choose Battery and turn on Allow background activity.