Unable to connect USB MIDI keyboard

I am working my way through the Cabbage 3 videos, which are, by the way, really helpful. At some point I wanted to start using my keyboard instead of the virtual one. When I use the ‘select MIDI input’ command I get, as expected:

where “Osmose 49 play” is the right one according to the Osmose v. 2.3 manual. The Osmose itself I set to ‘classic keyboard’ mode, so that it does not produce the MPE and aftertouch extra MIDI.

But when I select this I get an error message

and the Cabbage instrument cannot be controlled by the keyboard.

I am using 1.0.208-alpha - if that matters.