Check under device management that you are connected to Tenvis HR via Tenvis HR mobile app.
To start/activate photo-taking with Tenvis HR motion detection sensors, tap on the + icon that can be found between 'Home' and 'Me'.
Tap on 'Photograph' to launch the camera app integrated with the Tenvis HR app. Make sure to allow camera access when prompted to, during initial set-up.
Once photo-taking on Tenvis HR is activated, this is what is shown on Tenvis HR.