Make sure to leave the window open that asks you for the code. If you close this window and go back after you receive the code, the code will no longer be valid. If you need your browser to get your e-mail, open a new separate window, don't close it. Make sure you are using the most recent code sent to you and not using a prior one. Every time that you ask for a code it cancels out all the previous codes that were sent. Please wait a few minutes after each code request to receive your email. It is not generated instantly.
https://ttlc.intuit.com/community/security/help/what-if-i-m-having-trouble-with-my-filing-verificati...
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