Verify Office 365 Email Authentication

Verify has two options for authenticating to Office 365, one is through the Microsoft sign in page requiring an email and password, referred to as 'Delegated Access', the other referred to as 'Application Access', adds an Enterprise Application to the Azure AD/Microsoft Entra ID. 'Application Access' can be used for a user mailbox, and it must be used for a shared mailbox, where there is no password. The easiest way to add the Enterprise Application is via Verify itself, by completing the 'Initial configuration within Verify' section from the attached guide, which requires the Azure Tenant ID. Once that's done you can go through the 'Creating a mail-enabled security group' and 'Restricting the Enterprise Application to the Mail-enabled Security Group' stages to restrict it's access to the one mailbox.