Our first recommendation would be to verify which version you are currently using. Since the Deluxe version of TurboTax will not have that slip, you will need to use the Premier version if you plan to add a T3. Until the T3 slip is deleted, you are unable to proceed without upgrading the product.

In 2021, TurboTax optimized its editions to ensure that our customers are getting access to the forms needed to make the most out of every individual's tax situation and to respect his accuracy guaranty of the calculation. Since certain claims/expenses were moved to the appropriate edition. TurboTax is better able to guide our customers through their filing journey and ensure that no credits or deductions are missed. If the claim/expense is not covered by the Deluxe version, you will be automatically prompted to upgrade to the appropriate edition. 

Thank you for choosing TurboTax.