I really don't want to make a Microsoft account but many job interviews are held on Teams. I see that there is a web client which I will definitely use instead of the unofficial Flatpak for Linux.
If I create a Microsoft account with one of my privacy friendly emails (custom domain), would Microsoft start to receive the emails that that account receives? If so, would you suggest that I make a burner Microsoft account for this specific use case?
When you get invited into a Teams call you don't need a microsoft account to join as guest. you'll get the web interface probably.
Your mail goes where your MX records point. Microsoft will only see the mail if you move your mail to exchange.
I may be wrong but I don’t remember needing a Microsoft account for the web client. Click on the link, accept the usage of your mike and camera, and it should be enough. Open a private window if you want more privacy and I’m sure it will still work fine.