mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/serial/by-id/<your-mcu-id>: [Errno 2] No such file or directory: '/dev/serial/by-id/<your-mcu-id>'
This means either:
- Board not correctly flashed
- USB connection problems
- Debian 11 (Bullseye) udev bug - No board or serial found
Since you are
- using a non standard Linux / Host (Nintendo switch)
- you modified the firmware
- the support for the Kobra 2 series is not confirmed
- Anycubic has unknown modifications to Klipper
- Anycubic has not released the sources of their modifications
you are pretty much on your own.