Be sure the code is not ending up in your email's spam/junk folder or another email address you have. See this FAQ on some tips, which also includes info on how you can change the email address in your Account Profile settings, if you wish to use another email address.
FAQ: What if I'm having trouble with my filing verification code?
https://ttlc.intuit.com/turbotax-support/en-us/help-article/security-risk/trouble-filing-verificatio...
If that's not helpful, please phone Customer Support.
Support hours are 5AM-9PM Pacific every day this time of year during filing season.
FAQ: What is the TurboTax phone number?
https://ttlc.intuit.com/turbotax-support/en-us/help-article/account-management/turbotax-phone-number...
NOTE: If you are using Free Edition, phone support is not included. But you can contact a TurboTax Support agent for free directly via messaging at Twitter or Facebook.
https://www.facebook.com/turbotax
or
https://twitter.com/TeamTurboTax
