I am trying to setup my app so it can use Microsoft as an authorization option using Azure AD B2C

I got it all configured how I thought I needed to and it works for anyone with a personal account from outlook, hotmail, live and so on. It also worked for one person with a Microsoft account from this company we are trying to work with, he is a higher up and I am assuming has a higher tier license.

All of the people who work under him though it says there email isnt a microsoft email.

My expectation was that I set this up to accept any email whether its from a business or personal and it would just work, but of course it doesnt.

Any help would be appreciated