Ram here. I've got few questions on usecase scenarios to make few architectural recommendations:
Hi Ram -
Thanks for your questions:
1. We are going to be publishing guidance on OnPrem app access for B2B users soon. Stay tuned!
2. Yes. B2B users will be able to access any application that is integrated with Azure AD.
3. Please refer to this article on B2B vs. B2C: https://docs.microsoft.com/en-us/azure/active-directory/active-directory-b2b-compare-b2c and let me know if this answers your question.