There is no such thing as a "Messenger APK for iOS." Any website claiming otherwise is 100% fraudulent.
: For iPhone and iPad users, the legitimate version of Messenger is available exclusively through the Apple App Store in IPA format. testRigor AI-Based Automated Testing Tool Key Features of Messenger for iOS messenger apk for ios
Since you can't use an APK, you must follow the official Apple-supported method to get the app on your device: There is no such thing as a "Messenger APK for iOS