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.
~AlexTariq Razzaq commented
This is a very important feature which will allow people to use Microsoft Teams as a single tool. At the moment, the lack of support for multiple teams accounts is hindering uptake within a number of organisations I am working with