I had this question/problem for tax year of 2023. I was still not able to get turbo tax to give me the option for tabor tax refund after trying the above suggestions. I was still either doing it incorrectly or the software was preventing me. My solution was going directly to Colorado State and filing an amended return which worked easily and I did receive the refund. For 2024 I did not have an issue but I was more careful not to miss it this time in the initial preparation.
