I'm going to assume you're using SSSD to integrate with Active Directory. My guess is that the configuration of SSSD is simply different between your CentOS and Ubuntu servers. The "end of each number" almost certainly corresponds to the RID in Active Directory. This will generally get added to the range of a "slice" in SSSD. An Azure Active Directory Domain Services managed domain enabled and configured in your Azure AD tenant. If needed, the first tutorial creates and configures an Azure Active Directory Domain Services managed domain. A user account that's a part of the managed domain. Create and connect to an Ubuntu Linux VM