Office 365: How to get your tenant ID!

If you need to quickly get your Office 365 tenant ID, you can easily get it from the URL that provides access to the underlying Azure AD:

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As you can see in the screenshot, your Office 365 tenant ID is located after the DirectoryExtension/Directory/ path.

Referencia: https://support.office.com/en-us/article/Find-your-Office-365-tenant-ID-6891b561-a52d-4ade-9f39-b492285e2c9b?ui=en-US&rs=en-US&ad=US