I am a non-domain user with a personal account and a guest account for one of my customers. Recently, when presented with a Calendar invite that has a Teams meeting URL (I use Chrome browser and Gmail), the meeting is not opened. Teams does open, but doesn't go to the meeting. This had worked previously in earlier versions. But in 1.4.00.4855 (64-bit), it doesn't. I have ended up using the browser option as a workaround. I am running Linux Mint 20.1.
P.S. is there a way from the desktop Linux app to just join a meeting by its number?