@Barbara Fear - just to be sure we are all on the same page, you are eligible for either the 3rd stimulus of the Recovery Rebate Credit, but not both. If you don't believe you received the stimulus, then the Recovery Rebate is on Line 30 of Form 1040.
suggest the following
1) look at your transcript at IRS.gov and review the date the IRS says they sent out the stimulus (should be between March and May, 2021)
2) check your banking account records and see if that stimulus was deposited shortly after the date listed on the transcript.
if you don't find evidence of the stimulus deposit, then we have a 'stalement' (you say your didn't receive it but the IRS statesthey indeed sent it)
then, your only recourse if to fill out and submit Form 3911 which is a tracer form.
https://www.irs.gov/pub/irs-pdf/f3911.
does that help?
