Retirement Savings Contribution Credit

I meet all 4 requirements of this credit - not a student, over 18, not a dependent, under the AGI limit.  I made 401K contributions in 2020 into a qualified plan.  I should be eligible for the retirement savings credit, but turbotax is not calculating it.  It skips right over this line in the deductions and credits section. It does not let me update it or edit it.  In the personal income section, I entered my 401K contributions from box 12 and checked the retirement plan in box 13.  The description says that turbotax will calculate this credit for me, but is not doing it. Is there a bug in turbotax calculating this credit?