Last time I've tried it wants you to register and/or login, it sometimes loses the meeting in the process, you then are left with an application that tries to b

Last time I've tried it wants you to register and/or login, it sometimes loses the meeting in the process, you then are left with an application that tries to be Slack and you try to find the meeting in the app again, if you logged in to a different account than the invite to the meeting it gets lost etc. But it might be different today, for those problems I try to not use Teams for some time. Also if you use Teams all the time the experience might be different.