Retired couple in their late 70's, made a $40K Roth IRA conversion from Traditional IRA.

Fidelity sent them a letter seeing they must file Form 8606 (Nondeductible IRA).

When I go to Form 8606 Part II line 16 is blank, when I click on it takes me to the 1099R.

My question is why line 16 on Form 8606 is blank?