A recent Grants.gov article has been published discussing the SAM’s transition to the Unique Entity Identifier (UEI) which will replace the currently used DUNS number and how that impacts Grants.gov. This transition is scheduled to happen towards the end of 2020, though there are changes you will see in the next few months.
Fields currently labelled DUNS will be labelled “UEI”. For the time being, keep entering the DUNS number when fields are labelled UEI.
For more information on the UEI, please see the following: