Azure AD Tenant
The Azure Active Directory tenant to authenticate against (only used with Azure AD OAuth).
The tenant must be specified if using Azure Active Directory OAuth. The tenant is used to control who can sign into the application. This should be the name of the tenant such as xxx.onmicrosoft.com, the id such as 8eaef023-2b34-4da1-9baa-8bc8c9d6a490, contoso.onmicrosoft.com, or the word common.