Turbo Tax Premier 2021 Taxes Form 1040/1040-SR line 12

Married, filing jointly, total of $406 cash donations.  Error message with standard deductions entry of $300.  I  changed it to $406, actual number, since we do not qualify for the instructed $600 entry.  Still says error.  Tried the $600 that is supposed to be the right amount for a married couple to see what would happen, and an error message again.  I don't know how to fix this.  I want to enter what we actually did for cash donations, $406.  I do use Intuits It's Deductible, so that was imported while preparing my taxes.  Thank you for anyone who can give advice.