A super simple Electron app that will save your Microsoft Teams tokens in ~/.config/fossteams/.

yarn install
yarn start

yarn start

Warning: this operation doesn't delete / invalidate your token, but simply clears the cookies of the Electron browser.

yarn start logout

yarn start get-url

Log-in with your Microsoft Teams account (your corprorate / school account) and let this app do the rest. If you don't trust putting your credentials in a random GitHub app, audit the code for yourself: we're basically using Electron to intercept Oauth redirections and storing the tokens on your computer.

The Microsoft Teams authentication flow is described here. We're getting the token that is passed to https://teams.microsoft.com/go.