WhatsApp for Honor 90 Pro

Magic OS aggressively closes background apps to save battery, which holds back WhatsApp's push notifications. Go to Settings > Apps > App launch (App launch management), find WhatsApp, switch it from Auto to Manage manually, then turn on Auto-launch, Secondary launch and Run in background. Next open Settings > Battery > App launch and set WhatsApp to no restrictions. Finally, confirm WhatsApp's notification channels are enabled under Settings > Apps > WhatsApp > Notifications. See how others solved this on Reddit

The Honor 90 runs full Google Mobile Services, so WhatsApp should use Google's push (FCM), not a Huawei push framework. Don't install WhatsApp from Huawei AppGallery or restore it through a Huawei Health/Phone Clone backup, as that can pull a build that expects Huawei push. Uninstall that copy and reinstall WhatsApp from the Google Play Store. Then open Settings > Apps and make sure Google Play services and Google Play Store are enabled so push registers correctly. See how others solved this on Reddit

This is usually a permissions or storage-access block from Magic OS. Go to Settings > Apps > WhatsApp > Permissions and grant Photos and videos (or Files) full access, then clear WhatsApp's cache under Settings > Apps > WhatsApp > Storage (Clear cache, not Clear data). If large clips still fail, check that Settings > Apps > WhatsApp > Mobile data / Data usage isn't restricting background data, and try sending over a stable Wi-Fi connection. See how others solved this on Reddit

Magic OS needs WhatsApp exempted from battery optimization for calls to come through when the screen is off. Go to Settings > Apps > WhatsApp > Battery and set it to Don't restrict, then make sure the Calls notification channel is on under Settings > Apps > WhatsApp > Notifications. Also confirm Microphone permission is granted under Permissions, and that Do Not Disturb isn't silencing the call alert. See how others solved this on Reddit

Post-update crashes are typically a stale cache clashing with the new system build. Go to Settings > Apps > WhatsApp > Storage and tap Clear cache (not Clear data, which deletes chats), then update WhatsApp to the latest version from the Play Store. If it still crashes, back up your chats (Settings > Chats > Chat backup), then uninstall and reinstall WhatsApp so it rebuilds cleanly against Magic OS 9.0. See how others solved this on Reddit

WhatsApp's built-in camera can stutter on Magic OS, so the smoothest workaround is to shoot with the stock Camera app and attach the clip from the gallery using the paperclip icon instead of the in-app camera. It also helps to clear WhatsApp's cache under Settings > Apps > WhatsApp > Storage, confirm Camera permission is granted under Permissions, and keep both WhatsApp and Magic OS updated. See how others solved this on Reddit