Not able to amend a return for tax year 2020?

When I filed my return for 2020 in February, I discovered that a 1099 was duplicated and caused my income to be double.   I discovered the error immediately when a payment voucher printed, and attempted to amend the return.

 

I am still unable to amend this return, as TurboTax says the IRS has not yet updated the forms to amend a 2020 return. In the meantime the stimulus bill passed, and I will not receive the $5,600 due to the error. Instead of a $5,300 refund I am faced with a $10,700 tax bill. 

 

I talked to a tax professional who said he could e-file an amended return for me (at a cost of $200). I don't want to do that since I already paid for Turbotax.

 

When will Turbotax be updated to allow a tax year 2020 return to be amended? This is important!!!