OK I googled TTC code. It's for transmitting 1099 forms. Are you sending in 1099 forms you prepared to give to people you paid?
You can call support and ask them about it.
How to contact Turbo Tax
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-contact-turbotax/00/26991
What is the Turbo Tax phone number
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
