My return got rejected because my 2018 agi was innacurate. It was auto populated and im not sure how to update it with the correct one.

[flags164]

Not sure how to get the correct one.

[ee-ea]

See this   

https://ttlc.intuit.com/community/agi/help/how-do-i-find-last-year-s-agi/01/25947

[VolvoGirl]

When did you file 2018?  If it was late in the year try putting in 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

https://ttlc.intuit.com/community/agi/help/where-do-i-correct-my-agi-in-turbotax-online/00/26311

If you can’t get it to efile you will have to print and mail it.

How to mail a return from the Online version

https://ttlc.intuit.com/community/printing/help/how-do-i-print-and-mail-my-return-in-turbotax-online...