This item is still in the queue. I’m still awaiting more feedback and hope to have more details to share soon.
We are still considering this feature for future releases, and will continue to update the status when it changes.
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.
~AlexHarri Parker commented
This is very important when using Teams, main reason why Skype for Business is good and works so well, it does not matter, who You need to call even regular skype users. Switching between teams accounts where You have quest accounts on other companies is time consuming and You never know when should switch. Even worse is that You don't get notifications for other accounts.