While working with Azure or Office 365 you will likely have noticed that you get a default name space when you sign up. The namespace looks something like something.onmicrosoft.com, with something being whatever you want when you sign up for Office 365. If you have an Office 365 business tenant already, you can see this by going to the Admin portal and clicking on domains. The domain will look something like this.
In Azure you can view this by clicking on Active Directory under services, then click on domains.
You might dismiss this domain name as being unimportant because to you it’s just a name space, you will eventually overlay this with your own domain and be on your way. Becareful though as this domain is very important for one very simple reason. This is the default name space of your Azure Active Directory, and even though you will eventually overlay it with domains and UPN’s it still exists and it’s still the backbone name space of your directory services. Where things can get trick is when you are signing up for Azure and Office 365 separately, and you maybe unfamiliar with advanced options and inadvertently create a new Active Directory for yourself in Azure that your Office 365 tenant doesn’t seem.
To make sure that your Azure AD and Office 365 directories align properly there are a few steps you should take.
- Make sure your global admin for Office 365 is also managing your Azure subscriptions.
- Go to NEW / APP SERVICES / ACTIVE DIRECTORY / DIRECTORY / CUSTOM CREATE
- Select Existing Active Directory
It’s extremely important and will cause much less identify confusion if you sort this out before going down the road of having two Azure Active Directories and having to migrate, which is a story for another time.