Adding an Active Directory (AD) domain - Domains and Trusts

Adding an Active Directory (AD) domain - Domains and Trusts

To use a domain and make it known to the local on-premises Active Directory, follow these instructions.

These steps are often needed to prepare for a migration to Office 365 or Microsoft 365. By adding a domain you can set the UserPrincipalnames you need for authentication in Microsoft 365.

Once the domain is added, it can be used both on-premises and in the Cloud in the same 'way' we can say.

Connect to a domain controller

  1. Open the "Active Directory Domains and Trusts".
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2. Open the properties of Active Directory domains and trusts.

3. Right-click on the top item in the left-hand tree structure and select Properties.

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4. Add the desired domain to domains and trusts.

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Result

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2 domains were added. These can now be used in Active Directory. As UserPrincipalName on the user objects.

Example application

In the case of a user creation, the added domain can be used as a UPN.

It is recommended that all UPNs be adapted when migrating to Microsoft 365. Before Azure AD connect will be deployed.

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See also

Add a new domain to Microsoft 365 - Admin Center
Userprincipalname Customise with PowerShell in Microsoft 365
Microsoft Teams Administrator Center - Microsoft 365
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Jasper

Jasper

Welcome to 365tips.be. On this website you can read articles and experiences about Office 365 with focus on Microsoft Teams. Feel free to ask me a question and I will answer it in a blog post. Help others by giving feedback at the bottom of the articles. This blog is made in Dutch. The multilingual website is offered with best-effort machine translation.
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