From visual studio online you can request feedback on your application. I’ve played with it and it looks promising. Not sure if the stakeholder would open the email or install software requested in an email. But if they do this could lead to something.

Screenshots of my request feedback adventure.

Locate the Request Feedback link on the visual studio online project portal

Construct the request message

The feedback starts

Follow the instructions and provide feedback

Submit the feedback when done

Team explorer query to feedback