YES. I have the dubious honor of needing to use at least 4 different Teams tenants over the course of a week and it is enough to make me want to pitch my computer into the sea. App, browser, private browser - doesn't seem to matter. When I try to sign in, Microsoft will pick one of the tenants seemingly at random, regardless of what URL I use, and try to sign me in - of course, since there is usually no visual cue as to which tenant I'm looking at, I just put in a password and pray.