This is working today in the web client on Edge & Chrome. The team is actively investigating feasibility in the desktop client.
This item remains on the backlog.
We are working on a design with more density in mind. Until this design is solidified we are putting this item back to Under Review.
This continues to be on our backlog due to prioritization of other work items. We will update when there is more to share.
The team continues to make progress on this. We will share more details as we have them.
As stated in the last update, the ability to use multiple Teams accounts at the same time is being implemented in stages for Desktop. Faster tenant switching functionality on the Windows client has been rolled out to the public ring fully, and Mac will begin rolling out soon. Work is in progress on cross-tenant notification improvements, and support for multiple accounts on desktop will follow. We’ll keep you posted!
Note: The ability to use multiple Teams accounts at the same time is supported on iOS & Android today.
Alex & the Teams team
Multi-window chat is in testing. I hope to have great news regarding rollout to the public rings soon.
We are working to ensure that multi-window and other future multi-window experiences are of the highest quality when they release.
Thanks!Timothy Meyer commented
One possible work around at this point would be to open another instance of Teams from the Office 365 website and keep the Teams App as your primary focus.
The team has begun working on this feature. We’ll update as we have more details to share.