Apple Music download error "Too Many Devices"
I'm using Music.app (née iTunes) to play music on macOS with an active Apple Music streaming subscription.
When I press the "Download" button, I get the error:
Too Many Devices
To play offline content, you'll need to remove some devices from your account.
How can I view the current devices on my account? How can I remove a device?
How can I download Apple Music on this Mac?