Your AGI (adjusted gross income) is on line 11 of your 2022 Form 1040---your federal tax return form.
You received an email that we cannot see that tells you why your tax return was rejected and provide a description of the issue.
Some rejected returns can be fixed and re-filed.
If it was rejected for AGI—-your 2022 AGI might not be in the IRS system if you filed late. Try using zero instead.
Where Do I Correct My AGI