WhatsApp call notifications

We apologize for this issue , please advise the customer to follow this :

Disable Do not disturb and Power Saving on the phone
Disable Apps from Entering Deep Sleep and Data Saver Mode settings
Check if an app's notifications are turned on
Reset app preferences and Clear app cache
Reinstall the App
Approved on all permission
Contact the app developer
https://www.samsung.com/ae/support/mobile-devices/how-to-fix-the-notifications-not-appearing-on-my-samsung-device/#:~:text=Go%20to%20the%20Settings%20app,the%20desired%20app(s).