Blank login window - Fix it!
When I open the Teams app on my machine (Windows 8.1), I get a blank login window. I've tried completely uninstalling it and reinstalling it and the problem remains. My company's IT people can't figure it out either. The only way I can get it working is to close the blank login window, then it reappears, then I close it again and it says "Modern authentication failed here. Status code 4c7". Then it logs in some other way and works.
How do I fix this?
Rodney Hunter commented
We are having the same problem with a lot of our users. This problem seems to be related to MFA, as when we started using MFA across all users the problem significantly increased. This is happening on Windows 10 Enterprise 2016 LTSB in our VMware VDI environment. The issue doesn't seem to occur on any laptop or desktop devices from what we have seen.
Mikael Bohlin commented
50% of my 600 users have the same problem, especially after having changed their Windows password. Using MFA in Azure AD.
Doug Becker commented
I am also having this problem and it seems to be occurring with computers that have Windows 7 as none of my Windows 10 computers have this issue.
Ryan Babcock commented
Same problem here. I have one user who cannot sign in, it just shows a blank screen at login and eventually if you quit and open it a bunch of times it will work.Then after 30 minutes or so it prompts again for him to sign in and stops working.
Tried multiple restarts, reinstalls, all drivers and OS updates are there. This is very annoying.
Ryan Jones commented
same problem here
Robert Pos commented
Same problem here. New laptop and new newly installed office 365.
On the very beginning, I was asked few times for login and password, then finally Teams stuck.
Each next launch goes to white blank window, then I need to close it, then next white window, then close window again and finally (!) Teams is running.
Please fix it!
Erin Day commented
Same problem, often occurs when switching networks (public, internal) then often resolves itself. totally random when and who if affects. Login prompts is blank, clicking through twice gets you in. This needs to get resolved ASAP
Chris Crook commented
I actually don't even get a successful signin. Only consistent fix is uninstalling and reinstalling Teams all together.
Using Azure AD with MFA.
same problem here
Adam Gourlay commented
Having the same problem on many users. problem occurs when turning on MFA for the users.