Iphone whatsapp doesn't show new messages until i open the app?

I have an Iphone 4, and when people send me messages on whatsapp i don't get any notifications, and no sign on the whatsapp app on the background. When i open the app, than i see new messages appear. Why does that happen and how can i fix this?

Open Whatsapp > Settings > Notifications > Change everything to ON as you will need it on to get the notifications.

Let me know if this doesn't work.

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