return reject after correcting AGI

efile'd the 2021 return with my 2020 AGI and made up a pin, since I had never made an IRS pin for 2020 or anything but needed to enter something to submit

got the reject message AGI or pin

got the 2020 irs transcript

they did change the AGI from the return I sent in

not exactly sure why at this point  but for now why argue with IRS

I resubmit the efile with the AGI number from IRS

got the same reject

so not sure now if its the pin 

I have seen some posts suggesting to put in zero for AGI, that doesn't make sense to me since I have the AGI official IRS number from the transcript

how would I know if the reject  is in fact AGI caused or from pin?

can I just keep resubmitting trying to guess what AGI the IRS really wants? or do I risk getting black marked from the IRS and not able to submit at all?

please don't reply to call IRS :-))

thanks for looking