Modern authentication failed, Status code 4c7 – Microsoft Teams
When the authentication fails, you’ll receive the error message as described below: And if you check the logs, you may see information similar to the following: To resolve the Modern authentication failed – Status code 4c7 error message, you will have to enable Forms Authentication by using the AD FS Microsoft Management Console (MMC) snap-in on the computer that has the local copy of Active Directory. To do this, follow these steps: According to Microsoft, this error occurs because Microsoft Teams requires Forms Authentication. When you deploy AD FS, Forms Authentication is not enabled for the intranet by default. Form-based authentication is a term of art in the context of Web and Internet-based online networked computer systems. In general, it refers to the notion of a user being presented with an editable “form” to fill in and submit in order to log into some system or service. The advantage of form authentication is that users do not have to be a member of a domain-based network to have access to your application. So the number of web applications uses the form of authentication in their web application. There are three types of authentication in ASP.NET viz: If Windows Integrated Authentication fails, you are prompted to sign in by using Forms Authentication.
