If you filed 3/8 and haven’t seen any movement yet you likely are one who will have to verify something. You can log into irs.gov and when logged in look at the right side, you should see notifications and say something about needing more information. If it does you have to wait to receive a letter in the mail. If you have not received it yet, call and request a new one. You can also request a new one when logged into irs.gov .
