Presumably these users have audio in other contexts? Are they running the web app version of teams? Do other web apps play audio? From 10000 feet up, I wouldn’t start by blaming Linux here (even as a non-Linux-desktop user,)
This isn't a hill I want to die on, but isn't it the case that even if the problem is in MS software compatibility with Linux that still results in desktop Linux being a less reliable platform for day to day use?