The Unique Entity Identifier, or the UEI, is a 12-digit alphanumeric number that replaces the DUNS number. The UEI will be assigned by the System for Award Management (SAM.gov), and is required for Seller registration on Unison Marketplace.
For further assistance with your UEI number or managing your SAM.gov account, please reach out to SAM directly here or by calling 866-606-8220.