The engineering team is continuing to work on adding support for multiple accounts on desktop clients. We will first launch support for 1 work/school account and 1 personal account so users can enjoy Teams for work and personal side-by-side. Windows and MacOS. Support for multiple work accounts is still being worked on and will come at a later date.
You can track status via the roadmap here: https://www.microsoft.com/microsoft-365/roadmap?searchterms=68845.
This feature request is working its way through the backlog queue. No new details are available yet.
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Teams deployment has been super limited for our Org. for this exact reason.
We have spent years developing our SharePoint sites "not group sites" and need to keep our doc libraries with-in them.
It would be huge to have request #2 implemented for teams.