Microsoft SSO plug-in blocking Microsoft Teams sign-in

[RolindaS]

We have the Microsoft SSO plug-in Configure and deployed to all managed clients, upon initial sign-in or after sometime, signing into Microsoft Teams is blocked and end users are unable to sign-in to Teams, when we unstop the configuration profile from the affected devices users are then able to sign-into Teams, please note the SSO plug-in works with all other MS and 3rd Party apps that use Entra Authentication.

Please advise if anyone has this issue and if there are any solutions.  
Teams sign-in gets stuck here when selecting your account nothings happens no errors, no prompts.

[LucasZhang]

Dont use the plug in then

[RolindaS]

That's not very helpful.

[scottlep]

We have the same issue with a small percent of our users. It happens only with New Teams. In most cases users have been successfully signing-in for an extended period then suddenly cannot get past the "Welcome to Teams" window. All other MS apps work as expected for SSO. We have tried all standard troubleshooting steps. uninstall/reinstall, delete caches related to Teams/Office, clear Keychain items related to Teams/Office. It isn't related to a certain Teams or macOS version as we have seen the issue on various versions of both. We have even complete wiped a Mac, re-provisioned and the issue returned for that user a short time later. We have had a ticket open for weeks with MS and have gotten nowhere as usual. In some cases the user can randomly start using Teams as expected a few days/weeks after the issue. 

[RolindaS]

Thanks for your response, have you received any feedback from Microsoft? 

[andrew_nicholas]

Check this thread in the macadmins Slack: https://macadmins.slack.com/archives/C70CN1UUC/p1714582854943809.

[daniel_behan]

This one has been working for me.  I have a few more URLs than you do.

[elsmith]

We recently deployed the SSO plug-in, as well. At the time, we didn't realize it was related to Teams, specifically, but we did find something that worked to fix it (or band-aid fix it, maybe... too early to tell!). What we do see (not sure if this is the same thing y'all are seeing) is that EVERY application that uses MS SSO starts prompting like this:

How we've fixed it:

1. Close Teams if it's open
2. Open the Keychain Access application and search for Microsoft
3. Delete anything with "certauth.login.microsoftonline.com" in it (there's always one, may be two)
4. Delete anything with "accesstoken" in it (there's usually a BUNCH of these)
5. Close Keychain Access
6. Retry Teams

This has worked in about 95% of the "broken" folks we've had. Of course, it requires a call to the helpdesk which we're trying to avoid, so hopefully MS can fix this sooner rather than later.....

We've also seen other issues with the certificates in Firefox... and those are fixed in a similar fashion (but inside the app):

1. Open Firefox
2. Open settings
3. Search for certificates and click "View Certificates"
4. Click on Authentication Decisions
5. Delete the certauth.login.microsoftonline certificates (we usually see 2 or 3)
6. Click OK
7. Close Firefox