We're transitioning from SfB online to Teams. Our organization Coexistence is still set to Islands, but the Coexistence mode for most users have been changed at the individual level to Teams Only. We'd like to set the Org-wide coexistence mode to Teams only, and then set a few users to Islands mode so they can keep using SfB. Is that possible? Our current setup works, but it means we need to manually set every new user to Teams Only and that's an easy detail to miss.