Are you referring to Form 8915-F Qualified Disaster Retirement Plan Distributions and Retirements (Taxpayer) for 2021? If so, the form is not available yet and that is why the program will not let you file.
Form 8915-F is currently scheduled for release on March 24, 2022. You can monitor the status of the form in the below TurboTax help article. If the form becomes available sooner than the currently published date, the article will be updated to reflect the new availability date.
IRS forms availability table for TurboTax individual (personal) tax products