Here's an old thread from 5-6 years ago which might still be helpful, but I'm not sure. In any case read the whole thing. There are some screen images from the time lower down in the thread, but I'm not sure if it's still the same 5 years later. In any case, it looks like you will still have to phone TurboTax Support for this issue.
https://ttlc.intuit.com/community/taxes/discussion/where-do-i-get-the-confirmation-number-to-enter-i...
Here's how to reach TurboTax Support. Support hours are 5AM-5PM Pacific, Mon-Fri this time of year.
FAQ: What is the TurboTax phone number?
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
