issue solved, thanks to chatgpt : To authorize a macOS computer to access an iTunes or Apple Music library (or any other protected content), follow these steps: Authorize the Computer for iTunes/Apple Music: Open the Music or iTunes app: • If you’re using a recent macOS version, open the Music app. • If you’re using an older version, open iTunes. 2. Log in with your Apple ID: • Click Account in the menu bar. • Select Sign In. • Enter your Apple ID and password. 3. Authorize the Computer: • Click Account again > Authorizations > Authorize This Computer. • Enter your Apple ID and password if prompted. • The computer is now authorized to access the library. Authorize for Home Sharing: If you want to share your iTunes/Music library over a local network: 1. Enable Home Sharing: • Open the Music or iTunes app. • Click File > Home Sharing > Turn On Home Sharing. • Enter your Apple ID credentials to activate this feature. 2. Connect Another Device: • On the other device (Mac or Apple TV, for example), log in with the same Apple ID under Home Sharing. • You’ll then be able to access the shared library. Manage Authorizations: • Apple limits authorizations to 5 computers per Apple ID. • To check or remove authorizations: • Click Account > View My Account. • Scroll down to the Apple ID Summary to see how many authorizations are in use. • If needed, you can Deauthorize All Computers (this can be done once per year) and reauthorize the necessary devices. Troubleshooting: If you encounter issues: • Ensure your Internet connection is active. • Make sure macOS is up to date (Apple Menu > System Settings > Software Update). • If authorization fails, try signing out and signing back in with your Apple ID. These steps should allow you to properly set up authorization to access your media library on macOS.

same issue, 5 years later