@Dmytro Thank you for reaching out to us. As I understand you want to enable SSO for your application which you created in Azure AD B2C.
This article describes the single sign-on methods used in Azure AD B2C and helps you choose the most appropriate SSO method when configuring your policy.
Reference: https://learn.microsoft.com/en-us/azure/active-directory-b2c/session-behavior?pivots=b2c-user-flow#:~:text=time%20period%20specified.-,Single%20sign%2Don%20configuration,- %2D%20The%20Azure%20AD
Difference between "enterprise application" and "app registration" in Azure -
https://stackoverflow.com/questions/54071385/difference-between-enterprise-application-and-app-registration-in-azure
https://marileeturscak.medium.com/the-difference-between-app-registrations-enterprise-applications-and-service-principals-in-azure-4f70b9a80fe5
Let me know if you have any further questions, please feel free to post back.