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Once the browser loads this page, it 'rests' and waits for user input. These redirections occured very fast, and the HdxVideo.js javascript that the Browser Content Redirection Chrome Extension needs to inject is not done in time.

In this case, the url * needs to be whitelisted in the ACL policy in Studio.

Since Admins might not want to redirect the entire domain, better granularity can be achieved by leveraging a common parameter in OAuth 2.0 (redirect_uri, where the App name is embedded in the URL).

So whitelisting the following URL in the BCR ACL policy in Studio will achieve the objective, thanks to wildcards:

*teams*

The Chrome Extension will now be able to inject HdxVideo.js, and the first redirection happens. The user will end up being redirected to an Office 365 Authentication website that is linked to Teams (see screenshot above), but this time the website will be running locally on the endpoint's overlay browser that is part of Workspace app (HdxBrowserCef.exe).

Important: Please note that any IdP/SSO websites your organization deployed to authenticate users in O365 will also need to be added to the Authentication Sites policy (e.g. )

Please also note that Teams will require to add * to the Authentication Sites.

After a successful authentication, the overlay browser HdxBrowserCef.exe is pointed back to

This URL ( *) should now be whitelisted also in the 'Authentication Sites' policy in Studio.

Note: This might be somehow counter intuitive as the Authentication site is login.microsoftonline.com, not teams.microsoft.com - yet the problem in Teams is that the Chrome Extension is not loaded fast enough by the Browser and therefore injection fails on teams.microsoft.com.

Browser Content Redirection treats websites whitelisted under the Authentication sites policy as child websites that must remain redirected if the parent website was in the ACL whitelist policy. In the Teams case then, teams.microsoft.com is the child website of the parent login.microsoftonline.com

Microsoft Teams Live Events

Microsoft Teams Live Events are an extension of Teams meetings that enable you to schedule and produce events that stream to large online audiences.

Live Events are not optimized by HDX optimization for Microsoft Teams, so for an attendee, the video is rendered on the VDA instead, taking CPU/RAM/IO/Network resources on the virtual machine.

BCR provides a workaround to this problem - IT Admins can enable BCR and whitelist Live Events, so attendees open a Live Event URL invite on Chrome/Edge in the VDA and BCR will redirect the page to the client.

Typically, Org-wide Live Events permissions require a sign-in, so it is critical to understand your authentication MFA flow and whitelist accordingly.