Why do my reviewers have to log in to an Articulate account?

I've had this issue before and somebody on the team fixed it in the background. I have several reviewers who are unable to review my Rise course in Review because it is asking them to log in and they do not have accounts. They are all from the same organization and their emails end in @sap.com.

Can somebody help me fix this quickly? Deadline is looming and the developer always gets blamed....:-)!