1099-R After Tax Savings converted to Roth 401K

Hi -  within my 401K, I can contribute to a 401K, a Roth 401K  and/or an After Tax Savings Account. In 2021, I rolled over my entire After Tax Savings account to the Roth 401K. The plan administrator sent me a 1099-R form with an amount in the Gross Distribution in box 1,  an amount in the Taxable amount in box 2a,  the difference between Box 1 & Box 2 is in Box 5; Box 4, Tax withheld = $0, Code "G" is in box 7 and Box 14  State Tax withheld = $0. 

While reviewing my completed tax return, I noticed that on line 5b Taxable amount, it states "ROLLOVER" and an amount of $0, which I believe is incorrect because Box 2a of the 1099-R states the taxable amount. 

Am I correct or is TurboTax correct? If I am correct, how do I insert the taxable amount into TurboTax? 

Thanks in Advance!