You need the Microsoft Dynamics 365 for Operations user name and password to configure OAuth 2.0 authentication to access Microsoft Dynamics 365 for Operations.
Additionally, you need the service URL and application ID for OAuth 2.0 authentication.
To get these details, the organization administrator needs to register your Microsoft Dynamics 365 for Operations application with Azure Active Directory.
For more information about the registration steps with Azure Active Directory, see
Register your application.