Authentication by office 365 (Vue and Spring boot)

Question

Hi,

We have an application that use Vue as frontend framework and Springboot as backed - rest api server (resource server)

Our users known in the organization database and didn't need to register themselves. (They logged in to the application by user and password)
We want now to support another login option - login with Microsoft 365.
We want to use 365 only for authentication - not for authorization.
Another 2 points:

1. Our users come from many different organizations.
2. The Vue and spring applications deployed to our servers - not to Azure cloud.

Can you refer us to documentation that help to implement this login flow (We will prefer documentation with code examples)?

Thank you!