Reject code 504
https://ttlc.intuit.com/community/rejections/help/e-file-reject-r0000-504-02-the-name-or-social-secu...
AGI is Adjusted Gross Income. You need your 2018 AGI to efile 2019. The AGI is on 2018 1040 line 7. If you filed a Joint return you use the same AGI for each spouse.
How to find the AGI.
https://ttlc.intuit.com/community/agi/help/how-do-i-find-last-year-s-agi/01/25947
