1. iMore Question's Avatar
    I have tried everything! NOTHING WORKS!

    Solution 1: Log your Apple ID out of iTunes, and then log back in. Authorize both iTunes accounts.

    Solution 2: Delete the iPhone app that has been downloaded from different Apple account (account used for building app or downloading app)

    Solution 3 : If you purchasing apps with 2 unique Apple/iTunes IDs
    First de-authorize and signed out of all iTunes on all your Mac computers.
    Log out of iTunes on iOS devices.
    Now sign in to iTunes on 1 Mac and 1 iPhone with main iTunes login.
    Authorize Mac with main iTunes account login.
    Then authorize for any other Apple accounts you may have.
    Finally sync Device.

    Solution 4:Instead of syncing just make some changes in any videos or photos and press Apply.
    That’s all. iTunes will sync normally. Don’t press sync.

    Solution 5: Tick the check box”Manually manage Music & Videos”.
    Then click Apply, and sync button. ( it will return to usual authorisation error. don’t worry.)
    Again unchecked the box for manually manage music, click apply and sync.

    Solution 6: De-authorize your computer and uninstall iTunes
    Clean your computer with CCleaner.
    Reinstall new version of iTunes and authorize your computer again.

    Solution 7:
    Open iTunes on the computer
    From the menu bar select Account > Authorizations > Authorize This Computer
    Enter password for your Apple ID, done.

    10-01-2016 05:06 PM
  2. Just_Me_D's Avatar
    Call Apple Support for a possible remedy.
    10-01-2016 06:54 PM

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