Open a new browser tab and visit the Authorization URL returned by the InitializeOAuth Choreo. When prompted, log in to your Microsoft account and grant access. You will redirect to the Redirect URI specified during the registration process.
At this point, you'll be able to use your Client ID, Client Secret, Username, and Password to access your Office 365 account via the API.
Note: if you are building an application that needs to access Microsoft accounts for multiple users, you'll need to pass the Access Token returned by the FinalizeOAuth Choreo to authenticate your application's users. You can use the Refresh Token with the Microsoft > OAuth > RefreshToken Choreo when an Access Token expires.