The Directory ID is a unique identifier for your Azure directory. It is a 32 character long alphanumeric string. Finding the Directory ID ( also known as tenant ID ) is a very simple process. 

  1. Log in to Microsoft Azure as an administrator.
  2. In the Microsoft Azure portal, click Azure Active Directory.
  3. Under Manage, click Properties. The tenant ID is shown in the Directory ID box. 

The same is shown in the below graphic as well. 

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