A. 1. Ensure that your iPhone 12 Pro is running the latest version of iOS. Go to Settings > General > Software Update. 2. Clear the app's cache by going to Settings > General > iPhone Storage, selecting the app, and choosing 'Offload App'. Then reinstall it from the App Store. 3. If the app still does not launch, try resetting all settings by going to Settings > General > Reset > Reset All Settings.