You need your 2020 AGI to e-file your 2021 return. If all else fails, trying using a Zero for your 2020 AGI.
How to Find Your Adjusted Gross Income (AGI) to E-file Your Tax Return
https://turbotax.intuit.com/tax-tips/irs-tax-return/how-to-find-your-adjusted-gross-income-agi-to-e-...
