Accepted only mean the IRS Accepted it for processing not that it is Approved. Approved is the last step. Many returns from February are still being processed. Did you have an amount on 1040 line 30? The IRS is reviewing all returns with line 30. Did you already get the 1st and 2nd Stimulus checks? $600 sounds like the 2nd one.
A common problem this year is if you claimed the Recovery rebate credit on 1040 line 30 when you already got the Stimulus payment or got the second one after you filed or reported the wrong amounts or entered the wrong amounts in the 2 boxes. If you entered the total you got for both rounds in the same box it would think you didn't get the other one. The IRS knows how much they already sent you. You might have tried to claim it again on line 30.
