Go to Your Account.
Select the Content and devices option and tap on Devices.
Tap Deregister to remove each device.
Hover over the Account & Lists option from the top of the screen.
From the drop-down menu, click on the Your Account option.
Select Content and devices from the Digital content and devices section.
Switch to the Devices tab.
Click on Deregister for all the devices one by one to sign out of them.
Click on Deregister from the pop-up window.
Tap on Your Account > Content and devices.
Tap on the Devices tab from the top bar.
Tap on Deregister.
From the ensuing popup, tap on Deregister.
Also Read: How Do I Deregister Echo Dot from Alexa App
