Apple offers the number of devices connected to your Apple ID can not be extensive. With Apple TV or Apple Watch, these devices can still be used to keep track of your Apple ID.
For convenience's sake, you can manage your list of Apple devices right from your iPhone. Why You Should Check Your Apple ID Device List
If you are not longer have one of the listed devices, whether it was stolen, lost, sold, or given away, there's no point in them being attached to your Apple ID.
Two-factor authentication set.
From a security standpoint, two-factor authentication set Up for your Apple ID, it's even more important to remove the 2FA verification codes when logging into Apple or iCloud services from a new device.
Items That Show Up in Your Apple ID Device List
19659004] Apple product: iPhone, iPad, iPod Touch, Mac, Apple Watch, and Apple TV. show up in Find My iPhone so you can track them down if lost.
As far as non-Apple devices go, you Windows 10 machines that you logged into iCloud with, as a Surface Laptop 2 or Surface Go. Removing Items from Your Apple Device List
Deleting devices from your list can be done from iCloud.com, but this post just wants to focus on doing so.
Do not confuse this with the process of unlinking your iTunes account, which is very similar to a different thing. Authorized devices with iTunes are not allowed to remove them from your Apple ID account.
To remove devices you are not using anymore, tap its name , Device Info go to the very bottom and tap on the "Remove from Account" option.
Once you remove a device, it will never go back to the Internet your Apple ID logged in.