Apple Music
You must authorise this computer before you can play content saved offline on this computer. To authorise this computer, go to the Account menu and select Authorisations.
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User profile for user:
Rob_H1
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Community Specialist
Hey there zikel,
Thanks for reaching out to Apple Support Communities. We understand that you're needing assistance authorizing a computer. We're happy to provide some assistance.
Let's follow the steps outlined in this helpful article that relates to the issue you're having:
Authorize a Mac to play iTunes Store purchases
Authorize a computer to play iTunes Store purchases
You can authorize up to five computers (Mac, PC, or both) at a time. To play a purchased item on a sixth computer, you need to deauthorize another one. An iPhone, iPad, iPod, or Apple TV doesn’t count as a computer.
In the Music appon your Mac, choose Account > Authorizations > Authorize This Computer.
If requested, enter your Apple ID password to confirm.
We hope this helps.
Have a great day!