How do I authorize my MacBook Air?
How do I authorize my MacBook Air so that it will play music?
MacBook Air 13″, macOS 11.3
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In the Music app; see the following instructions from Authorize or deauthorize your computer for iTunes Store purchases - Apple Support
How to authorize a Mac or PC
Before you authorize a Mac, update it to the latest version of macOS. On a PC, update to the latest version of iTunes for Windows.
- On a Mac, open the Music app, Apple TV app, or Apple Books app. On a PC, open iTunes for Windows.
- Sign in with your Apple ID.
- In the menu bar on your Mac or PC, choose Account > Authorizations > Authorize This Computer.
If you're asked to authorize your computer again, it won't use a new authorization. Apple ID uses the same authorization for the same computer.