alexa.amazon.com: Learn All About Echo Dot Setup
Users who want to change their email account registered to the Alexa device can change it using the alexa.amazon.com interface using their mobile device. You need to go to the "My Profile page" of the change email page to successfully change the email account registered to your Alexa account. To confirm the email change you will also receive a verification link in your current email that you have to click to make a successful change in the email account.
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