A tax due is what you have to pay to the IRS. It is not a refund. Have you entered everything? The program isn’t ready yet. There are lots of updates to come. A tax due means you didn’t have enough tax withholding taken out of your pay or out of other income like a IRA distribution. Did you have other income in addition to W2 income?
There still have to be a lot of updates to the software for 2024, so the results you are getting are likely to be incomplete or inaccurate at this time. Employers will not issue W-2's until sometime in January; you need to wait for any 1099's which you will get in January or early to mid February. But in answer to the immediate issue---"tax due" means money that you owe and will need to pay to the IRS. If you are getting money back, it is called a refund. "Refund" and "tax due" have opposite meanings.