Thanks all for the help. Here is what I ended up with:
My taxable income actually worked out to $0 for 2020, which is why no contributions were permitted for 2020.
After speaking with my Advisor, I realized that I had the option of claiming the deductions for this year's contributions on either 2020 or 2021's returns. I had apparently already allocated these contributions to 2021, so do not need to include them on my 2020 return, and thus should not need to amend my return.
