Active Directory is a directory service developed by Microsoft that manages permissions and access to networked resources. It’s crucial for IT support because it helps manage user accounts, computers, and security settings within an organization.

In the Active Directory Users and Computers (ADUC) console, I would right-click on the appropriate organizational unit (OU), select “New” > “User,” fill in the required information, assign a password, and set any necessary permissions and group memberships.

I’d first check if the user account is locked or disabled. Then, I’d verify the user is entering the correct credentials and check the network connection. If the issue persists, I’d investigate group policies, security settings, or potential replication issues in AD.