How to enable Apple ID
How to enable my Apple ID to update my apps
iPhone 7 Plus, iOS 11.3.1
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If the account has been disabled or locked try resetting its password (and then logging out and back in everywhere) : If your Apple ID has been locked - Apple Support
If that doesn't fix it contact iTunes Support and see if they can/will re-enable it : http://www.apple.com/support/itunes/ww