If you are using TurboTax Online, then you are in the correct year (2023).
There are two places that Home Office information may be entered, depending on how you earn your income. If you are self-employed, then the Home Office information is entered as part of the Schedule C. The answer given above regarding the order of entering home offices applies in this case.
The other section where home office expenses may be entered is in the Job-Related Expenses section when you are a W-2 employee. Due to the Tax Cuts and Jobs Act passed in 2017, only certain categories of employees may claim these expenses as part of their Federal return. However, they may be claimed on your state return, depending on your state.
That being said, I checked this section to try to understand the message you are seeing and I got the same result both in the online version and the CD/downloaded version of TurboTax. The date entered for the office start date seems to only be captured on a worksheet that is kept for your own records. The important information used in the calculations comes later when you enter the other details about the home office use and income associated with the office.
To get around the situation, just enter 12/31/2022. The rest of the home office expenses should not be affected in any way.
@Dorner
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