The AGI for 2019 appearing on my tax return is the one that the IRS is now rejecting , why?

It is the 2019 AGI they are looking for.  If you have repeatedly re-entered the corrected number and got rejected, you might need to submit your return by mail.  Please also try the number zero.  See link here:  Correct AGI got rejected

There are three ways you can use to locate your AGI:

If you have your last year's tax return, read here: Find your AGI

If you used TurboTax online to file, you can access your account here Login and download a copy of your prior year’s 1040 tax return to find your AGI.  Click here for instructions: Prior year's return

If you do not have a copy of the tax forms, you may order a transcript from the IRS.  Click here Get  Transcript and select  "Get Transcript Online "  or request a full copy of your past year's tax return.  Click here: https://www.irs.gov/forms-pubs/about-form-4506

Once you obtained your 2019 AGI, follow this link Fix a reject to return to your account to enter your AGI and re-submit.