How many people are on your tax return? The first EIP round 1 was 1,200 (2,400 married) and 500 for each dependent. The second EIP was 600 per person. The EIP2 would be 2,400 for Married with 2 dependents or Single with 3 dependents.
If you claimed a missing stimulus payment on your return but the IRS took it off you have to ask the IRS. They think they already sent it to you. Maybe it went to an account you don't remember. Or you got a check or a card. It was probably easy to miss the debit card in the mail and think it was junk mail. They have to put a trace on it.
See Question G4 here,
https://www.irs.gov/newsroom/2020-recovery-rebate-credit-topic-g-correcting-issues-after-the-2020-ta...
