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Microsoft Edge: Sign in to Edge with a Google account
Microsoft Edge users on Windows and macOS can now sign in using Google accounts in addition to Microsoft accounts. Admins should configure the NonMicrosoftAccountSignInEnabled policy to manage this capability per organizational security requirements.
Action required: Review and configure the NonMicrosoftAccountSignInEnabled policy to control whether users can sign in with Google accounts in Microsoft Edge.
Microsoft's description
Users can now sign in to Microsoft Edge using a Google account in addition to the Microsoft account from the profile menu and Edge sign-in screen. Available for Windows and macOS devices. Admins can control availability to this feature using the NonMicrosoftAccountSignInEnabled policy.