The WPO365 | LOGIN plugin can help you to connect your WordPress website with users outside of your organization using Azure AD B2B or Azure AD B2C.
In the latest knowledge base article https://docs.wpo365.com/article/131-azure-ad-b2b-based-single-sign-on you will find a comprehensive guide on how to configure a simple Azure AD B2B based self-service sign-in and sign-up user flow for Google users that you want to allow access to your WordPress website using the WPO365 | LOGIN plugin.
Read more https://www.wpo365.com/azure-ad-b2b-user-flow-for-google-users-for-wordpress/