Existing Guest Accounts and the Azure B2B Collaboration Policy

When you impose a block on certain domains, you’d like to think that applications like Teams will respect that block. As it turns out, if you have some lingering guests in your Azure Active Directory, the B2B collaboration policy might not be as effective as you’d hope.

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Microsoft to Support Google IDs for Azure B2B Collaboration

Microsoft has launched the preview of Google B2B Federation, which allows Google accounts to be used to access Azure AD apps. Quite how this will work out for apps that use guest user accounts is unknown at this point.