My WhatsApp doesn't notify me on new mesgs.

[MKNote20Ultra]

Ever since I've upgraded to Note 20 Ultra, my WhatsApp doesn't notify of any new mesg. Only when I open WhatsApp, it downloads all the new messages. 

[JEEVA777]

If your WhatsApp in deep sleep mode, you will not notify for new Messenges. Put WhatsApp in never sleeping mode.

[Babayaga575]

Open app info of whatsapp and do these ;)

[cs_member8]

Dear Samsung Member,

Greetings from Samsung Customer Support!

We acknowledge your query and apologize for the same. Please perform the below mentioned steps to resolve the issue:

* Check app cache: Clear cache memory of a particular application: Setting >Apps >Now pick the app. For example 'Samsung Internet' >Storage >Clear Cache.

For further assistance, register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).

Thank you for writing to Samsung.

Warm Regards,
Samsung Customer Support