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.
How to put a trace on a missing 1st or 2nd Stimulus payment.IRS for Payment Issued but Lost, Stolen, Destroyed or Not Received
See question F3 here, you can expand it to see how to put a trace on it.
Return thru TT auto filed. Still haven’t seen my return
How much is your refund supposed to be? Do you have the missing 600 on 1040 line 30? If they think they already sent you the 600 they will reduce your refund or send you a new tax due bill.
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