My app is not installing on iOS 9 devices (I don’t have an iOS 9 device myself but my testers are reporting the app is not installing). Can anyone see anything obvious in my ionic info output or my plugins list that will be a problem with iOS 9? If anyone can, that might save me some time! 
Ionic:
ionic (Ionic CLI) : 4.0.6 (/usr/local/lib/node_modules/ionic)
Ionic Framework : ionic-angular 3.9.2
@ionic/app-scripts : 3.1.11
Cordova:
cordova (Cordova CLI) : 8.0.0
Cordova Platforms : android 7.1.0, ios 4.5.5
System:
ios-deploy : 2.0.0
NodeJS : v8.11.3 (/usr/local/bin/node)
npm : 6.3.0
OS : macOS High Sierra
Xcode : Xcode 9.4.1 Build version 9F2000
Environment:
ANDROID_HOME : not set
cordova-plugin-add-swift-support 1.7.1 "AddSwiftSupport"
cordova-plugin-advanced-http 1.11.1 "Advanced HTTP plugin"
cordova-plugin-app-version 0.1.9 "AppVersion"
cordova-plugin-apprate 1.4.0 "AppRate"
cordova-plugin-badge 0.8.7 "Badge"
cordova-plugin-calendar 5.1.2 "Calendar"
cordova-plugin-device 2.0.2 "Device"
cordova-plugin-dialogs 2.0.1 "Notification"
cordova-plugin-file 6.0.1 "File"
cordova-plugin-file-opener2 2.0.19 "File Opener2"
cordova-plugin-file-transfer 1.7.1 "File Transfer"
cordova-plugin-globalization 1.11.0 "Globalization"
cordova-plugin-inappbrowser 3.0.0 "InAppBrowser"
cordova-plugin-ionic-keyboard 2.1.2 "cordova-plugin-ionic-keyboard"
cordova-plugin-nativestorage 2.3.2 "NativeStorage"
cordova-plugin-network-information 2.0.1 "Network Information"
cordova-plugin-photo-library 2.1.1 "Photo Library"
cordova-plugin-screen-orientation 3.0.1 "Screen Orientation"
cordova-plugin-splashscreen 5.0.2 "Splashscreen"
cordova-plugin-statusbar 2.4.2 "StatusBar"
cordova-plugin-touch-id 3.3.1 "Touch ID"
cordova-plugin-whitelist 1.3.3 "Whitelist"
cordova-plugin-wkwebview-engine 1.1.4 "Cordova WKWebView Engine"
cordova-support-google-services 1.1.0 "cordova-support-google-services"
es6-promise-plugin 4.2.2 "Promise"
phonegap-plugin-multidex 1.0.0 "Multidex"
phonegap-plugin-push 2.2.3 "PushPlugin"