Feature description
If you intend to make (parts of) your WordPress website available to customers, partners or basically to any other user with a Microsoft Services Account e.g. @microsoft.com, @outlook.com, @live.com or @hotmail.com, you can use the PROFESSIONAL, PREMIUM or INTRANET edition of the WPO365 plugin to do so.
For further technical details please refer to the Configuration documentation https://docs.wpo365.com/article/47-support-for-multitenant-apps but select the option to allow Accounts in any organizational directory (Any Azure AD directory – Multitenant) and personal Microsoft accounts (e.g. Skype, Xbox)).