[Webkit-unassigned] [Bug 219505] New: Issue logging in to Microsoft Teams if logged into other Microsoft accounts and navigating directly to teams.microsoft.com

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=219505

            Bug ID: 219505
           Summary: Issue logging in to Microsoft Teams if logged into
                    other Microsoft accounts and navigating directly to
                    teams.microsoft.com
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: katherine_cheney at apple.com

In https://bugs.webkit.org/show_bug.cgi?id=218778, we fixed multiple login paths for Microsoft Teams, which relies on third party cookies from login.microsoftonline.com. There is one edge case which this fix did not cover:

1. The user was logged into other Microsoft sites prior to https://bugs.webkit.org/show_bug.cgi?id=218778
2. They go straight to teams.microsoft.com (not through the login page on www.microsoft.com/en-us/microsoft-365/microsoft-teams/)
3. Since a login has occurred on another Microsoft site, it seems that the login step is skipped
4. Teams enters a login loop because there is no storage access

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