Music app displays unknown error 100030 when downloading music
Been trying to download music through my Apple One account and I keep getting an "unknown error -100030" and none of my music downloads. Any ideas on how to fix?
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Are you using a VPN or any other 3rd party Optimizing or Anti-Virus software?
One way to test would be to try downloading while booted into safe boot. If it works there,
than it means something you have installed in your default account is causing a problem.
PS - The apps I mentioned above are completely unnecessary and are known to cause issues with macOS.
Start up your Mac in safe mode - Apple Support