To get the information you are requested that would be done by your IT department, they will login to your organizations Azure Portal and setup an app registration, there they will connect a service account to your onestream SSO application. more details can be found in the design and reference guide for setting up Rest API. if your organization has OIS enabled i recommended you just create a PAT token more information can be found in this post
https://community.onestreamsoftware.com/t5/OpenPlace/Just-Added-to-OpenPlace-FXM-and-CDM/m-p/35201#M181
