Deauthorize all devices
How can I deauthorize all computers a second time in a year?
MacBook Air 11", macOS 10.12
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Try contacting iTunes Support and see if they can/will do so : http://www.apple.com/support/itunes/ww (click on your country's flag, the country where you live, and which is therefore the country on the account ; click on Contact Support towards the top right ; click on Get Help under 'Talk To Us’)