The user.PendingEmailAddress will be set to the give address and a new verification email will be sent.
Once the link in the email is clicked on then the user account will be updated to use the new email address
Change Email Address
Log in to your account
The OAuth token may not be valid. Either log in to you account to fresh it or use an API Key.
The API Key you provided may not be valid. Please check it or use the OAuth Token.