See devices signed into my account
Want to see what devices are logged into my account
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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.