WhatsApp for Vivo X90

OriginOS/Funtouch aggressively kills background apps to save battery, which delays or silences WhatsApp. Open Settings > Battery > High background power consumption and allow WhatsApp, then go to Settings > Apps & permissions > Autostart and enable WhatsApp so it can run after a restart. Finally, open the Recent apps screen, swipe down on the WhatsApp card (or tap the lock icon) to lock it in memory so the system stops clearing it. See how others solved this on Reddit

OriginOS updates often reset autostart and background permissions, so re-enable them. Open Settings > Apps & permissions > Autostart and turn WhatsApp on, then go to Settings > Notification & status bar > Manage notifications > WhatsApp and confirm Allow notifications is on with the Messages and Calls channels enabled. Finally allow WhatsApp under Settings > Battery > High background power consumption so it isn't throttled again. See how others solved this on Reddit

Floating (heads-up) banners are controlled per channel in OriginOS. Open Settings > Notification & status bar > Manage notifications > WhatsApp > Messages and enable Banner/Floating notifications and Lock screen notifications. If banners still don't appear, make sure WhatsApp's autostart and background activity are allowed so the notification channel stays active, and check that Do Not Disturb isn't on. See how others solved this on Reddit

Incoming-call alerts rely on the separate Calls channel plus the permission that lets WhatsApp draw a full-screen call over the lock screen, both of which updates can disable. Enable Settings > Notification & status bar > Manage notifications > WhatsApp > Calls, then grant Settings > Apps & permissions > App manager > WhatsApp > Permissions > Display over other apps (this powers the full-screen incoming-call screen). Re-enable WhatsApp under Autostart and allow it in High background power consumption so the call screen can launch while the phone is locked. See how others solved this on Reddit

The code arrives by SMS, so first confirm your number and country code are correct and that you have signal, then wait out the full timer before retrying. Check that the sender isn't blocked in the Messages app and that on a dual-SIM phone the code isn't going to the other SIM. If SMS keeps failing, tap the Call me option to receive the code by voice, and disable any VPN before trying again. See how others solved this on Reddit

OriginOS throttles the background work for a second WhatsApp account (or a cloned/dual app) the same way it does the main one. First confirm notifications are enabled inside WhatsApp under Settings > Notifications for both accounts. Then allow WhatsApp (and the App Clone version, if you used Vivo's dual-app feature) under Settings > Battery > High background power consumption and enable it in Autostart. Locking the app in Recent apps and turning off Do Not Disturb helps the secondary account ring reliably. See how others solved this on Reddit