Ah, no, I mean, if you're using it for your corporate account on your AD-joined computer. These things usually have a single (work) account.
I wouldn't be surprised if it was never meant to be multiple-account, and that was just half-added as an afterthought at some point.
I have my corporate account, me@corp.com, which is also configured on my domain-joined pc. This works well enough.
And with this same account, I connect to a separate tenant, where I'm a "guest". This separate tenant belongs to a partner corp, and they delegate the authentication to our tenant for people in our corp. So, I can almost use my credentials, meaning that I can use my regular login/password but have to have two MFAs (one for each tenant) for some reason.
But the "main" account seems aware of the other one because even on a fresh Windows install, just adding my me@corp account to teams adds the other one too. I just can't switch between the two without restarting teams, so I can only use one at a time.