Authorization of Devices
I have only three authorized devices, yet I cannot authorize a fourth. What should I do?
MacBook Air 13″, macOS 10.15
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Just computers (up to five) can be authorized. Authorize or deauthorize your computer for iTunes Store purchases - Apple Support
If unknown or previous devices are (still) authorized, then you can Deauthorize all, and then re-authorize just the wanted ones.
- Authorized computers are different from ‘associated devices’ (roughly: computers + mobile devices). View and remove your associated devices for purchases - Apple Support
- Both of these are different from devices where you are signed in with your Apple ID account (computers + mobile devices + other personal devices). Check your Apple ID device list to see where you're signed in - Apple Support