You may be able to fix update issues by signing out iCloud and then signing in again.,, This is the ID you use to sign in to iTunes.
,, When the password is accepted, you’ll be signed back in to iCloud.
Open the Settings app.
Tap iTunes and App Store.
Tap your Apple ID.
Tap Sign Out.

,
Tap Sign In.

,
Enter your Apple ID and password.
{"src": "wikihow-all_validation", "title": "How to Troubleshoot iPhone Apps Not Updating3"}