We know you are patiently waiting for this feature. This feature is being implemented in stages. Fast tenant switching is currently in testing both internally and with early customers. We expect to release to the public in the Fall. I’ll post an update once it’s rolling out.
Full multi-tenant, multi-user support will be added after fast tenant switching.
~AlexGary Rikard commented
This is a real need. I have the same use case. Some of my clients have adopted other tools because of this gap. This feature will go along way with conversion of users back to Microsoft. It will also help convert heavy Google users in private equity companies to Teams.