Problems listening to apple music
What to do? The subscription is paid, but the music is not downloaded.
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You are not supposed to change Apple IDs on a device regularly. That might be seen as an attempt to cheat the system. Several services (mostly related to downloads of protected content) will show this warning when you try to anyway. Apparently this device was linked to a different Apple ID only 18 days ago.
About associated devices - Apple Support
“When you try to associate another Apple ID with a device that was already associated, you might see a message that says, "This device is associated with another Apple ID. You cannot associate this device with another Apple ID for [number] days." Depending on when you associated your device with your Apple ID, you might need to wait up to 90 days to associate the device with another Apple ID.”
The subscription with this Apple ID can be used, but the next couple of months not on this device.