As widely known, Microsoft Teams runs on desktop computers with Windows OS or Mac OSX or Linux. The “Teams” app is based on “Electron” (https://www.electronjs.org).
“Electron” runs a packaged web technology based app inside a Chromium based application.
Microsoft Teams is such a “web technology based app” that runs in such a Chromium based application locally on a computer.
Normally the “Developer Tools” are disabled in “Microsoft Teams”.
But there is a trick to enable the “Developer Tools” on “Microsoft Teams”:
(Left) click 7 or more times on the “Teams” icon besides the clock.
Now right-click the icon once. There you see the Developer Tools:
2. Mac OSX
It’s almost the same with Mac OSX: There you click the “Teams” icon in the tray 7 times.
(I’ll add a screenshot later.)