Step 1: Settings SettingsBTN.png > Device maintenance > Battery > Unmonitored apps > Add appsy > WhatsApp Service > DONE

Device maintenancebaterryUnmonitored appsadd appswhatsapp service

Step 2: Settings SettingsBTN.png > Biometrics and security > App permission monitor > WhatsApp Service > Turn OFF

Biometrics and securityApp permission monitorWhatsApp service

Step 3: Settings SettingsBTN.png > Apps > WhatsApp Service > Mobile data > Allow background data usage & Allow app while Data saver > Turn ON

appswhatsapp serviceMobile dataturn on settings

Step 4: Settings SettingsBTN.png > Apps > WhatsApp Service > Battery > Allow background activity > Turn ON

appswhatsapp servicebattery