Step 1:- Connect to your Azure Porta Account and Select the Active directory ( Default Active Directory).

Step 2: Add some users in this Default active directory

Step 3: Connect to Azure DevOps Organization to the Default directory. On the top right corner select the account —> Switch directory –> Default directory (Double check the tenant ID). If it asks for Create a Project create then create a new project.

Step 4 : Go to Organization Settings–>Users –>Add users and Assign it to Project

Step 6:- Goto Project Setting —> Teams —> add users