How to remove a phone, tablet, or PC from accessing your Google account This is an important security step to go through whenever you sell off a device or just no longer plan to use it with Google
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How To Remove Unused Android Devices From Google Play Store
Settings does not list every device since Maps is listing devices where Maps is/was installed but does not have google play. Like iPad. It seems that really old (with last used time stamp) will hide device from Maps (year or two?) and more than three-four years will eventually remove it from Play as well. Compare Google Pixel Phones - Google Store Devices on Google Play moved to the new Google Store! Devices you add to your cart must have the same Preferred Care plan. Add or remove Preferred Care for this device to match what’s already in your cart, or buy this device in a separate order. Google Play Store for iOS - iPhone & iPad Free Download
Settings does not list every device since Maps is listing devices where Maps is/was installed but does not have google play. Like iPad. It seems that really old (with last used time stamp) will hide device from Maps (year or two?) and more than three-four years will eventually remove it from Play as well.
Jun 17, 2014 How to remove old Android devices from the Play store - CNET