You can file ITR-1 for AY 2021-22, but only if you are seeking a refund and require condonation under Section 119(2)(b). To do this, you must first apply for condonation with the CIT of your jurisdiction. Once approved, you can then proceed with filing your ITR. For FY 2019-20 and 2020-21, the ITR-U form is available, though schema details are still pending.
03 May 2022
You may file ITR-U for FY 2019-20 and 2020-21. Form is notified on 29.04.2022 in accordance with sec 139(8A) as introduced by Finance Act, 2022 , but schema etc are yet to be notified. Wait for some time.