YOUR V®350 CONNECT IS NOT YET CONNECTED
The Mac number (12 digits working in pairs from 00 :E1 :xx :xx :xx :xx) is located on the back of the monitor, bottom right, in the insert that reads: Somfy.
YOUR V®350 CONNECT IS INSTALLED
The Mac number is shown in the app, in the "My devices" menu, "V®350 Connect."