When you try to sign in to Microsoft Teams in Microsoft Edge, Internet Explorer or Google Chrome, the site continually loops, and you can never sign in.
Cause
This issue occurs if your organization uses Trusted Sites in Internet Explorer and doesn't enable the URLs for Microsoft Teams. In this case, the Teams web-based application cannot sign in, as the trusted sites for Teams are not enabled.
Resolution
Change Microsoft Edge, Internet Explorer or Google Chrome settings using administrator rights or a Group Policy object (GPO).
Microsoft Edge
In the Edge Settings window, select Cookies and site permissions then select Manage and delete cookies and site data under Cookies and data stored.
Turn on Allow sites to save and read cookie data (recommended) and make sure Block third-party cookies is turned off. Alternatively, follow step 3 if you need to keep third-party cookies blocked.
In the same window, under Allow, select Add to add the following sites:
- [*.]microsoft.com
- [*.]microsoftonline.com
- [*.]teams.skype.com
- [*.]teams.microsoft.com
- [*.]sfbassets.com
- [*.]skypeforbusiness.com
