If your spouse passed away in February 2023 and you filed your 2022 tax return after the date of death, filing a joint return and signing as surviving spouse is the proper way to file that return. Your spouse was alive during 2022, but was not able to sign the 2022 tax return. Perhaps the red flag was generated by filing the return before the IRS records were updated showing your spouse had passed away, but that is just a guess.
For the 2023 tax return, you are in the same situation unless you have remarried during 2023. You can file a joint return for 2023 and the return will be signed as 'filing as surviving spouse'. It is possible that the IRS will examine the situation again, but there is no way to predict that. Just know that you are not doing anything that should raise a red flag based on the information that you shared.
To learn more, see the following TurboTax help article:
How should I file my return if my spouse recently died?
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