How to find Office 365 Tenant Id

Find your Office 365 Tenant ID via the Azure AD Portal

http://blog.velingeorgiev.pro/how-find-office-365-tenant-id-new-azure-ad-portal

Use Powershell

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

You can use Windows PowerShell to find the tenant ID. You’ll need the Microsoft Azure PowerShell module.

Open a Microsoft Azure PowerShell command window and run the following script, entering your Office 365 credentials when prompted.

Login-AzureRmAccount Your tenant ID is listed in the output.

Or use your webbrowser

https://login.windows.net/YOUROFFICE365DOMAINNAME.onmicrosoft.com/.well-known/openid-configuration