When creating users with Active Directory Administrative Center (ADAC), the New User workflow highlights the required attributes with indicators. The Administering Windows Server Hybrid Core Infrastructure materials note that ADAC uses a modern schema-driven form in which "Full name (CN)" and
"User UPN logon" are the minimum required identity fields to create the object in the directory. The wizard auto-generates the sAMAccountName from the UPN by default (you can edit it), but sAMAccountName isn't required to be manually entered to complete creation. Likewise, Password can be deferred depending on your provisioning pattern (for example, creating a disabled or pre-staged account or enforcing "User must change password at next logon"), and fields such as Profile path and First name are optional profile details. The guide explains that ADAC "derives the RDN from Full name" and relies on UPN as the primary modern logon attribute in Azure AD-connected/hybrid scenarios, ensuring uniqueness within the UPN suffix. Therefore, to successfully create User1 using ADAC without additional, non-mandatory properties, you must provide Full name and User UPN logon.