How to fix Apple iPhone X apps that won’t update

Check your Apple ID and make sure you're using the right Apple ID to access the App Store. If you're already logged in but still can't update applications, try logging out and back in again.

1. Go to the Settings-> iTunes & App Store menu to do so.
2. Then, at the top of the screen, tap on your Apple ID.
3. After that, quit Settings by tapping Sign Out.
4. Return to the Settings app and choose iTunes & App Store.
5. To sign back into your Apple or iTunes account, tap Sign in and input your Apple ID credentials.