Shelly Plus 2 PM Power Measurement Issue

Hello everyone, I recently installed five Shelly Plus 2 PM devices on my roller blinds. I set them up as covers and updated their firmware. However, I’m facing an issue where none of the devices are showing power consumption—they all display 0 watts. I tried calibrating them through the app, but it didn’t work since the power measurement isn’t functioning.

The devices are connected to 20-year-old Gira toggle switches, which were previously controlled by a central system that’s now disconnected. I’m wondering if there’s something I missed in the setup or if there’s a way to enable power measurement through the software.

Any advice or tips would be greatly appreciated! I’m really hoping to get this working so I can monitor and manage my energy usage effectively. Thanks in advance for your help!