Muthukamatchi , via OnePlus 9 , Dec 6, 2021 : When I open WhatsApp that time only I saw a new message what's the solution for that Anyone knows please help me
Shailender Sharma , Dec 6, 2021 : This thread might help you, the link is below for your reference- https://forums.oneplus.com/threads/whatsapp-notification-issue.1417197/
Xcommunicad0 , via OnePlus 8T , Dec 6, 2021 : Hi, please check if background data usage is enabled as well alongwith the battery optimisation as suggested in above thread.
