Remember that while HR might use teams for interviews, that doesn't necessarily mean that it's used internally. I'd recommend to ask about their internal communication software before making a decision.
i feel like if HR is using teams for interviews... there's a 95% chance it's using teams internally too. The same could not be said for zoom or google meet; where internally teams might be whats used. So to me I think it's a great leading indicator to run (not walk) away.