Context
- Suddenly Microsoft Teams Windows client stopped connecting and shows a white page instead or logging in.
- Quitting or rebooting teams did not solve the issue. NO ADFS is in place
- Azure AD Connect is in place with Seamless Single Sign-on enabled
Resolution
Seems that Teams modern authentication is linked to internet explorer settings. IE Settings had javascript blocked because office.com wouldn’t load. This was following a computer setting change. I had to reset the IE settings to fix OFFICE.COM not loading.
After this Microsoft TEAMS was loading !
Error in Microsoft teams logs
Fri Nov 09 2018 15:00:11 GMT+0100 (Paris, Madrid) <10264> — event — Microsoft_ADAL_api_id: 176, Microsoft_ADAL_correlationId: cddc6b2a-fc0d-4b35-925b-4cf14864a0bb, Microsoft_ADAL_response_rtime: 1543103, Microsoft_ADAL_api_error_code: 4c7,Fri Nov 09 2018 15:00:11 GMT+0100 (Paris, Madrid) <10264> — info — Could not login user – status: 4c7 diag:1Fri Nov 09 2018 15:00:11 GMT+0100 (Paris, Madrid) <10264> — error — SSO: ssoerr – (Login Window) Could not login user – status: 4c7Fri Nov 09 2018 15:00:11 GMT+0100 (Paris, Madrid) <10264> — error — SSO: ssoerr – SSO Uber catchFri Nov 09 2018 15:00:11 GMT+0100 (Paris, Madrid) <10264> — info — L’authentification moderne a échoué, mais vous pourrez toujours vous connecter. Le code de votre statut est 4c7. diag:0Fri Nov 09 2018 15:00:11 GMT+0100 (Paris, Madrid) <10264> — info — adalsso:statusChanged to: L’authentification moderne a échoué, mais vous pourrez toujours vous connecter. Le code de votre statut est 4c7.Fri Nov 09 2018 15:00:11 GMT+0100 (Paris, Madrid) <10264> — info — Sso failed, updating cookie settings. Status:4c7 diag:1Fri Nov 09 2018 15:00:11 GMT+0100 (Paris, Madrid) <10264> — info — Focusing main window
More information about Microsoft Teams modern authentication
What is modern authentication?
Microsoft Teams has implemented a better way of signing in—we call it modern authentication. (If you’ve ever heard the term “single sign-on ” or “SSO”, that’s what we’re talking about here.) The benefit of modern authentication is that it makes it possible for you to sign in to Microsoft Teams without re-entering your email and password every time you want to start a new session. It’s a more secure and reliable way to sign in to Microsoft Teams.
Modern authentication is a process that allows you to sign in to an app securely. Since modern authentication includes SSO, it’s also part of the process that lets Microsoft Teams know that you’ve already entered your credentials (like your work email and password) elsewhere, and you shouldn’t be required to enter them again to launch the app.
About the Author:
Almost 10 years later, from SharePoint on Premise to Office 365, I love every aspects with these technologies. From development to training, consulting, architecture to pre-sales, I’ve been enjoying the path because we see the impact of collaborative solutions on daily life employees.
Initially, I posted on my blog what I couldn’t find on the internet about troubleshooting issues about SharePoint. Then it evolves into reviews, and notes for myself, before I forget :).
Reference:
Angama, J. (2018). Microsoft Teams – Modern Authentication. Available at: https://jeffangama.wordpress.com/2018/11/26/microsoft-teams-modern-authentication/ [Accessed 3rd April 2020].
