Office 365 Users lets you access user profiles in your organization using your Office 365 account. You can use the Use the connection in your Power Platform app.
Dataverse is part of the Microsoft 365 collaboration and productivity tools. Using federation, applications can connect to Dataverse using the same system user identities and credentials available in an Azure Active Directory based network.
Scenario:
* Users must be active employees of Fabrikam.
* Quality inspection app: Fabrikam is evaluating Microsoft Power Platform to determine whether it can meet the company's requirements for a manufacturing defect and quality inspection solution. Each machine produced must be subjected to a quality inspection at various points during production. Each machine must undergo a more extensive quality inspection before the machine can be shipped to the customer.
Reference:
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/connections/connection-office365-users