What did you add up? You do not add anything. The AGI is not on your W2s. The AGI is only the amount on your 2018 return line 7.
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.
https://ttlc.intuit.com/community/agi/help/how-do-i-find-last-year-s-agi/01/25947
