Hello AstraZeneca,
Thank you for using Apple Support Communities!
It sounds like you are trying to enter a pin number into the app, but keep getting this error message.
I recommend the troubleshooting from this article named:
iOS: Troubleshooting apps purchased from the App Store
http://support.apple.com/kb/TS1702
Update your device to the latest version of iOS.
You can setup apps to update automatically in Settings > iTunes & App Store, but make sure that your apps are up to date:
- Open the App Store and tap Updates. If updates are available, tap Update All.
- If prompted, enter your iTunes Store account information. App Store will then download and install the app updates.
Note: Some apps may require a Wi-Fi connection to update.
If none of your user-installed apps will launch, there could be an issue with Apple ID authorization. Download and install an app that isn't already installed on your device to reset this information. You can also remove an app from your iOS device and download it again from the App Store or sync the app from your computer.Note: If you have installed apps using multiple Apple ID accounts, you may need to perform this step for each account.
If the issue affects only a single app, try closing just that app.
Turn the device off and on.
Remove the app from your device and reinstall it:
- Tap and hold any app icon on the Home Screen until the icons start to wiggle and show a small "x" in the top-right corner of the app.
- Tap the "x" in the corner of the app you want to delete.
- Tap Delete to remove the app and all of its data from your device.
- Press the Home button.
- Go to the App Store.
- Search for the app and then download it again.
Note: If it is a paid app, ensure you are using the iTunes account you purchased the app with originally. If it is not, you may be asked to purchase the app again. Learn more about downloading previously purchased items.
If you continue to experience the issue, contact the developer of the app for further assistance:
- Find the app in the App Store.
- Open the app's page, tap Reviews, and then App Support.
Take care,
Sterling