The Arduino email account can be changed from one email address to the another email address. Please make sure that, you are not logged-in with a Sign in with Google option from the Arduino log in page.
Below are the guidelines to change the email address of the Arduino account:
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Go to arduino.cc and sign-in to your Arduino account.
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Click on your profile icon on the top right corner and select the profile sub-section.
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You can change the email address from the change option as shown in the picture below.
