Allow quick switching between accounts (personal, work)
Make it easy on the user interface to toggle between work and personal teams. Done in the right way will help drive adoption of Teams for Personal use and not just work use.
I would really like to launch directly in my personal or my work teams using seperate start menu shortcuts. this is needed on Desktop AND mobile (Android) so that when checking private messages like during a holiday I don't get bothered by work-notiofications (and vice versa)
We also have this problem in business life: freelancers are often belong to teams in different companies. If we integrate them (or customer employees) in our project-teams they have to be „connected“ to our teams environment. But if they in our environment they miss all news and calls from their other teams … annoying! Why don’t you solve it like an e-mail account in outlook? Several accounts in the same App – working and being active at the same time.