Why does an @gtempaccount.com email address appear when I'm signed into AdWords?
If you have not moved your data or selected a new account email address to associate with your data, you will see a temporary email address when you sign in to a conflicting Google Account with AdWords on it. You can change this by associating your AdWords account with either your organizational email address or a personal email address.
Despite seeing an @gtempaccount.com email address when signed in to AdWords, your password and security settings have not changed. You will continue to be able to sign in to AdWords using your previous email address and password.