Certain email providers are known to be very slow with codes which can cause difficulty. I have seem issues with Yahoo and AOL more frequently than others. Also, if you received a code previously, it may look like a reply to the first email. Be sure to scroll down and look at the time stamps. If all else fails, you can do an account recovery request here:
https://ttlc.intuit.com/turbotax-support/en-us/help-article/security-risk/account-recovery-request-t...
