When you install and configure the plugin then by default only only users with accounts in your own organizational directory are able to sign into your WordPress website.
However, if you intend to make (parts of) your WordPress website available to customers, partners or basically any user with a valid Microsoft login, then you can do so by adding support for
- Accounts in any organizational directory (Any Azure AD directory – Multitenant),
- And / or personal Microsoft accounts (MSAL e.g. Outlook, Skype, Xbox).
Additionally, you can configure a so-called Domain whitelist to control which users are granted access and / or can register.
For further technical details please refer to the Configuration documentation
View a chart that compares all features available with all editions.