You asked about this in another thread. If you did not successfully file a 2020 return and use the recovery rebate credit to get the $600 stimulus, sorry, but the deadline to do that was May 17, 2024. It is too late now.
You can check to see if the IRS issued that to you and have it traced if they issued it and you did not receive it.
Check your own bank account for deposits of the stimulus checks, and check your online account with the IRS to see what the IRS shows they sent to you.
Try checking your online account with the IRS (and if you filed a joint return—check for BOTH of you)
https://www.irs.gov/payments/your-online-account
If you need to trace a payment that the IRS says has been issued to you, mail or fax a completed IRS Form 3911, Taxpayer Statement Regarding Refund.