Sorry it doesn't matter any more. It is too late to efile. You have to print and mail your return now.
Your AGI is on 1040 line 11. If that rejects then you should try entering 0 for the AGI. the IRS took a long time to process 2020 returns so the AGI didn't get entered in time. And since you are filing 2021 late then use 0 to efile 2022 next year.
