Did you see these articles? You can correct the AGI in the Online version and Desktop programs. You need to enter the AGI yourself.
When did you file 2018? If it was late in the year like after September the IRS doesn't have the AGI in the right database to look it up and verify it. So you have to use zero for the AGI.
And see, https://ttlc.intuit.com/community/rejections/help/what-if-i-entered-the-correct-agi-and-i-m-still-ge...
How to correct the AGI in the Online version
https://ttlc.intuit.com/community/agi/help/where-do-i-correct-my-agi-in-turbotax-online/00/26311
To correct the AGI in the Desktop program
https://ttlc.intuit.com/community/agi/help/where-do-i-go-to-correct-my-agi-in-the-turbotax-cd-downlo...
