remove device from my account

To remove a device from your account, see the following.

Log into https://appleid.apple.com/account/manage

Then in the Devices section click on your device.

To remove a device, click on the Device name and then click Remove from account.

Or go to Settings > [username] > [device name] on an iPhone or iPad.

Or go to Apple menu > System Settings > [username] > [device name] on Mac.