How do I access TurboTax's calculations of Line 5 on Schedule 8812?

I received a CP11 notice from the IRS stating that they "...changed the refundable Child Tax Credit amount claimed..." After several hours on the phone, speaking to 2 different reps, they thought that the problem was with Line 5 on Schedule 8812. My return had one number, and they reduced it by over $2000. I have 5 dependents (all recognized as legal dependents) and did not receive any Child Tax Credits in 2021 (or any year) as part of the Covid stimulus. My question is how do I access TurboTax's calculations to justify it's value to the IRS on Schedule 8812?