My 2021 federal return was accepted. i need to amend the Economic Impact Payment because I never received it. Can I amend it if it was just accepted today?

[DoninGA]

If you were not a dependent and your Adjusted Gross Income was below the minimum to receive the Recovery Rebate Credit, then you were asked if you received the 3rd stimulus payment.  If you indicated no, then the credit is entered on your federal tax return Form 1040 on Line 30.  If you indicated yes, then nothing was entered on Line 30.  If you received the credit then it is included in your federal tax refund or it would have reduced the amount of taxes owed.

Look at your tax return - Form 1040 Line 30