Deauthorize previous computers
Unfortunately, I do not have access to my previous laptops/desktops to deactivate my iTunes. Is there another way to do that without having the physical laptops/desktops?
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See Authorization vs. association - Apple Community. You need a computer running iTunes to use the deauthorize all command. If you have no access to a computer at all then you could potentially ask Apple Support to do it for you.
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