The DUNS Number is no longer used to create or up-date SAM
Beginning April 4, 2022, the Unique Entity ID (UEI) from SAM.gov is now the authoritative identifier for those doing business with the federal government. The DUNS Number is no longer valid for federal award identification.
The UEI is generated in SAM.gov. If you are registered in SAM.gov (active or not), you were already assigned a UEI number. If you are registering for the first time, you will get your UEI during the registration process.
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