Having this exact same issue. Got the error while reviewing, clicked 'fix,' but my spouses birthdate was not missing. Re-entered it, tried deleting it, pressing continue, then re-entering it. Nothing. I'm guessing I can just skip the error code but would like confirmation.
We are sorry you are having this problem. Please make sure you are only typing the birthdates by using numbers - no special characters or spaces. There should be 8 numbers and the format to use is DD/MM/YYYY. Ex: If your birthday is April 5, 1954, then you would type: 05041954
You may want to select and delete everything in each box before retyping, just in case there is a hidden space causing the problem.
If further help is needed with this situation, I believe your best option is to contact our telephone support team as they have the option to view your screen to help resolve the issue. To contact us please follow this link: Contact Us form. Once you go through the steps and complete the form, the phone number to speak to a TurboTax agent will appear on the page.
Thank you for your patience.