Hi AWomanHasNoUsername,
Based on the message that you're receiving in your original post, we recommend that you try the steps here: View and remove your devices that are associated with Apple ID purchases - Apple Support
To perform the recommended troubleshooting steps via the link above, complete the steps in the section titled "More about associated devices."
Want to add a new device to the list? Just use that device to make a purchase from the App Store, Apple TV app, or another Apple service.
You can have ten devices (no more than five computers) associated with your Apple ID for purchases at one time.
When you try to associate a device that was previously associated, you might notice a message that says, "This device is associated with another Apple ID. You cannot associate this device with another Apple ID for [number] days." You might need to wait up to 90 days to associate the device with a different Apple ID.
This list of associated devices is not the same as the list of devices that you're currently signed in to with your Apple ID. You can find out where you're signed in on your Apple ID account page.
Please do not hesitate to reach back out to us if you have questions or need any additional support.
Thanks for using the Apple Support Communities.
Cheers!
