Please see this Turbo Tax FAQ on how to find your AGI from last year.
https://ttlc.intuit.com/community/agi/help/how-do-i-find-last-year-s-agi/00/25947
two options if continued rejection. print and mail form 4868 and state extension, if required. they must be postmarked by midnight on the due date. The IRS has a website where you can file your extension
https://www.irs.gov/forms-pubs/extension-of-time-to-file-your-tax-return
if you owe you can use IRS direct pay to make payment which gives you an automatic federal extension
https://directpay.irs.gov/directpay/payment?execution=e1s1
for reason select extension.
state extension requirements are different
I had the same rejection reason:R0000-679-01 - 'PrimaryPriorYearPIN' or 'PrimaryElectronicFilingPIN' or 'PrimaryPriorYearAGIAmt' in the Return Header must match the e-File database.
I did verify my AGI prior to submitting. ???
1. How can I "try again" to file an extension via TurboTax? It doesn't seem to give me that option.
2. Did the IRS take my tax payment that I sent with the extension? or do I need to pay again?
Same thing just happened to me. No idea if I need to resubmit the payment.
Turbo Tax will not know if the IRS receives a payment. Please contact the IRS to inquire.
How do I contact the Internal Revenue Service (IRS)?
https://ttlc.intuit.com/community/irs/help/how-do-i-contact-the-internal-revenue-service-irs/00/25943