CAN w/ SKRat v1.0 and EBB36 v1.2

Using BTT SKRat v1.0 w/ EBB36 v1.2 - via the CANBUS port. I have flashed both MCU and EBB36 using RatOS configuration steps 2 & 3. However, getting error below in Klipper logs:

mcu 'toolboard': Unable to open serial port: [Errno 2] could not open port /dev/btt-ebb36-12: [Errno 2] No such file or directory: '/dev/btt-ebb36-12'

Any ideas what I might be doing wrong? Appreciate any advice - thanks!
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