Prior to April 1, 2022, you can register on SAM.gov with your DUNS number to get a UEI. If you do not have a DUNS number to register with, then you need to wait until April 4, 2022 to register directly on SAM.gov without a DUNS number and gain a UEI number in the process. SAM.gov registrations that are in progress as of April 1, 2022 can be resumed on April 4, 2022.