Did you efile? Was it Accepted? Maybe you didn't finish filing it or it Rejected. When you log into your account you should also see the status and if it was Accepted or Rejected, Started, Printed, Ready to Mail, etc. what does it say?
Then when you efile you get back 2 emails. The first email only confirms the transmission. The second email says if the IRS (or state) Accepte.d or Rejected your efile. Check back though your emails if you have them.
You have to check with the IRS. Did they send the refund? Maybe they changed your refund. 1200 sounds like the first or second Stimulus payment. Did you have 1200 on 1040 line 30? What is your filing status? The IRS might show the already sent you the Stimulus payment. Double check your bank account. Especially Jan & Feb 2021. That was for the second Stimulus payment. Line 30 was only if you didn't get the Stimulus payment or qualify for more. Not the amount you already got.
EIP1 The first Stimulus payment was 1,200 for each spouse and 500 for each dependent under 17. Came out in spring of 2020.
EIP2 The second Stimulus was 600 per person and dependents under 17. The 2nd stimulus checks started going out at the very end of December 2020 and continued into January/Feb 2021.
The first 2 Stimulus payments went on your 2020 return even if you got the second one in Jan/Feb 2021.
