Install Azure AD Connect to Integrate On-Prem ADFS with AAD (Hybrid Identity)

Pre-requisites

Azure AD

• You need an Azure AD tenant. 
• Add and verify the domain you plan to use in Azure AD. An Azure AD tenant allows, by default, 50,000 objects. When you verify your domain, the limit increases to 300,000 objects. 

On-Prem Prepare

• Use IdFix to identify errors such as duplicates and formatting problems in your directory before you synchronize to Azure AD and Microsoft 365.
• Review optional sync features you can enable in Azure AD, and evaluate which features you should enable.
• The Active Directory schema version and forest functional level must be Windows Server 2003 or later. 
• If you plan to use the feature password writeback, the domain controllers must be on Windows Server 2016 or later.
• The domain controller used by Azure AD must be writable. 
• Using on-premises forests or domains by using "dotted" (name contains a period ".") NetBIOS names isn't supported.
• We recommend that you enable the Active Directory recycle bin.
• Azure Active Directory Connect runs signed PowerShell scripts as part of the installation. Ensure that the PowerShell execution policy will allow running of scripts. The recommended execution policy during installation is "RemoteSigned".

Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope LocalMachine
Get-ExecutionPolicy -List

Scope ExecutionPolicy
 ----- ---------------
MachinePolicy Undefined
 UserPolicy Undefined
 Process Undefined
 CurrentUser RemoteSigned
 LocalMachine RemoteSigned

Installation prerequisites

• Azure AD Connect must be installed on a domain-joined Windows Server 2016 or later.
• The minimum .Net Framework version required is 4.6.2, and newer versions of .Net are also supported.
• Azure AD Connect can't be installed on Small Business Server or Windows Server Essentials before 2019 (Windows Server Essentials 2019 is supported). The server must be using Windows Server standard or better.
• The Azure AD Connect server must have a full GUI installed. Installing Azure AD Connect on Windows Server Core isn't supported.
• The Azure AD Connect server must not have PowerShell Transcription Group Policy enabled if you use the Azure AD Connect wizard to manage Active Directory Federation Services (AD FS) configuration. You can enable PowerShell transcription if you use the Azure AD Connect wizard to manage sync configuration.
• If AD FS is being deployed:
  • The servers where AD FS or Web Application Proxy are installed must be Windows Server 2012 R2 or later. Windows remote management must be enabled on these servers for remote installation.
  • You must configure TLS/SSL certificates. For more information, see Managing SSL/TLS protocols and cipher suites for AD FS and Managing SSL certificates in AD FS.
  • You must configure name resolution.
• It is not supported to break and analyze traffic between Azure AD Connect and Azure AD. Doing so may disrupt the service.
• If your global administrators have MFA enabled, the URL https://secure.aadcdn.microsoftonline-p.com must be in the trusted sites list. You're prompted to add this site to the trusted sites list when you're prompted for an MFA challenge and it hasn't been added before. You can use Internet Explorer to add it to your trusted sites.
• If you plan to use Azure AD Connect Health for syncing, ensure that the prerequisites for Azure AD Connect Health are also met. For more information, see Azure AD Connect Health agent installation.

Express installation of Azure AD Connect

Introduction Express Installation

Steps:

1. Sign in as a local administrator to the server you wish to install Azure AD Connect on. You should do this on the server you wish to be the sync server.
2. Navigate to and double-click AzureADConnect.msi.
3. On the Welcome screen, select the box agreeing to the licensing terms and click Continue.
4. On the Express settings screen, click Use express settings.
   
5. On the Connect to Azure AD screen, enter the username and password of a global administrator for your Azure AD. Click Next.
   
   If you receive an error and have problems with connectivity, then see Troubleshoot connectivity problems.
6. On the Connect to AD DS screen, enter the username and password for an enterprise admin account. You can enter the domain part in either NetBios or FQDN format, that is, FABRIKAM/administrator or fabrikam.com/administrator. Click Next.
   
7. The Azure AD sign-in configuration page only shows if you did not complete verify your domains in the prerequisites. 
   If you see this page, then review every domain marked Not Added and Not Verified. Make sure those domains you use have been verified in Azure AD. Click the Refresh symbol when you have verified your domains.
8. On the Ready to configure screen, click Install.
   • Optionally on the Ready to configure page, you can unselect the Start the synchronization process as soon as configuration completes checkbox. You should unselect this checkbox if you want to do additional configuration, such as filtering. If you unselect this option, the wizard configures sync but leaves the scheduler disabled. It does not run until you enable it manually by rerunning the installation wizard.
   • Leaving the Start the synchronization process as soon as configuration completes checkbox enabled will immediately trigger a full synchronization to Azure AD of all users, groups, and contacts.
   • If you have Exchange in your on-premises Active Directory, then you also have an option to enable Exchange Hybrid deployment. Enable this option if you plan to have Exchange mailboxes both in the cloud and on-premises at the same time. 
9. When the installation completes, click Exit.
10. After the installation has completed, sign off and sign in again before you use Synchronization Service Manager or Synchronization Rule Editor.

Add additional sync admins

By default, only the user who did the installation and local admins are able to manage the installed sync engine. For additional people to be able to access and manage the sync engine, locate the group named ADSyncAdmins on the local server and add them to this group.

Assign licenses to Azure AD Premium and Enterprise Mobility Suite users

Now that your users have been synchronized to the cloud, you need to assign them a license so they can get going with cloud apps such as Microsoft 365.

Verify the scheduled synchronization task

Use the Azure portal to check the status of a synchronization.

Start a scheduled synchronization task

Tasks to Manage AAD Connect 

Enable Sync features: