When the contract is awarded, you need to publish a Contract Award Notice.
Where the procurement was advertised prior to 11pm on December 2020 in the OJEU, the Contract Award Notice should also be published in the OJEU, ideally with a copy also to the Find A Tender service.
If the contract was initially advertised on or after 11pm on December 2020 on Find A Tender, the Contract Award Notice should also be published on Find A Tender. There is no need to publish the notice in the OJEU for these procurements.