What is teams training? Please provide full details and debug logs if you are having issues
JMR is not intended for teams. It wont capture from the app, but you can use the DVR capture method if using the teams through your browser, but teams has built-in recording features so I would use that as it is going to be better.
generic screen recording is built into windows 10 and 11. No need for that feature in JMR any more. Also Teams has builtin recording features itself.