There is no such thing as individual AGI amounts on a joint return. A joint tax return shows only combined totals for both spouses. You both have the same AGI - the total AGI on the joint return.
Why are you looking for individual AGI amounts? What are you trying to do?
Do You need your 2019 AGI to efile 2020? The AGI is on 2019 1040 line 8b. If you filed a Joint return you use the same AGI for each spouse.
How to find the AGI.
If you didn't file 2019 or filed it later in the year or mailed it, then try entering 0 for the AGI. If that doesn't work you will have to print and mail your return.
Or request a transcript from the IRS