Configure SSO for Customer Self-Service Portal with a third party application

Summary:

Our customer is an University. As soon as a student signs their contract, an account is created on a third party application that holds information regarding all of the student's classess, teachers and other types of information. Our customer needs us to develop a Customer Self-service portal so that their students can open service requests directly into sales and service. In order to achieve the business requirement, we need to configure a SSO from their portal into our Customer Self-Service

Content (please ensure you mask any confidential information):¿How can we enable SSO on Customer Self-Service portal?

How can we obtain the URLs we need in order to configure SSO in Azure?