Microsoft Teams is a popular collaboration platform that allows you to communicate with your work team remotely. However, its users often get affected by annoying errors and issues from time to time. A major issue that is increasingly affecting Teams users.
Notably, Microsoft recently addressed the Windows 10 VPN internet connectivity bug by releasing out-of-band updates. The bug restricted users from connecting to the internet. More specifically, the notification area on the taskbar either showed limited or low internet connection.
Those users who are affected by the same issue can download the cumulative updates from Microsoft Update Catalogue. Apparently, the Windows 10 update KB4554364 seems to be causing issues for Microsoft Teams users. Some people reported that they can no longer log in to their accounts due to the error code 4c7.
KB4554364 Causes MS Teams Login Issues
According to the reports, IT Administrators are now complaining that PCs running Windows 10 v1909 and v1903 (of course with Microsoft Teams installed) are running into login issues after installing KB4554364. It is noteworthy that users who initially closed Microsoft Teams encountered error code 4c7 upon login.
However, the problem is noticed in an environment where people were trying to log into Teams account from a network where Microsoft’s ADFS (Active Directory Federation Services) is running. Consequently, a login attempt triggers the following error:
“Modern authentication failed here, but you’ll still be able to sign in. Your status code is 4c7.”
Enable Forms Authentication To Fix Microsoft Teams Login Issues
Luckily, some users found a solution to fix the Microsoft Teams error 4c7. If you are on the same boat you need to enable a setting, since it’s disabled by default for ADFS environments. To fix the MS Teams login issue, you can use ADFS Microsoft Management Console (MMC) to enable Forms Authentication. Microsoft has mentioned a workaround in a support article.
Here are the steps you need to follow:
- First, log in to the machine where the local Active Directory is located and then open the ADFS Microsoft Management Console.
- Navigate to the left panel and click the Authentication Policies option.
- Head over to the Actions section on the right side and click the Edit Global Primary Authentication option.
- Now select the Intranet tab and click Forms Authentication.
- Finally, click OK to save the new settings.
Once you have followed the aforementioned steps, MS Team login works again and the error should disappear.
Did the solution work for you? Let us know in the comments section below.