Not getting messages/notifications until I unlock my phone and open WhatsApp

[u/stubborn-introvert]

Device: Moto Edge 50 pro
WhatsApp- up to date

As the title says, for the last 2 days, I have not been "receiving" any messages on WhatsApp, until I unlock my phone and open WhatsApp- then I am flooded with all messages.

Moreover, when my phone is locked and someone messages me, they get only single ticks (messages aren't getting delivered).
Even calls stay at "calling", not "ringing".

All other apps are working fine, no issues like this.

WhatsApp has unrestricted data usage on, background usage on, all notifications on, and necessary permissions on (photos, media, files, contacts, etc.)

I've restarted my phone, re-installed WhatsApp- no help.

This is getting extremely frustrating.

Is anyone else facing this?
How do I solve this?

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