Should i try entering 0? I have already submitted the correct number for my AGI. IRS told me that the paper return that i filed in 2019 was processed after November

Yes, you should use a Zero (0) for your 2019 AGI.  The IRS was very late on processing 2019 returns, so any 2019 that was processed late, you need to use a Zero for the 2019 AGI.