@timothyz The IRS has yet to update the Form 5695 instructions for tax year 2023. Until those instructions have been updated then TurboTax cannot finalize the Form 5695. As stated the dates are subject to change so even if TurboTax entered the date as Unknown, users will still complain.
IRS website for the Form 5695 Instructions for 2023 Draft Mode - https://www.irs.gov/pub/irs-dft/i5695--dft.pdf
