ubus call onion omega-led doesn't work

[Steve Smythe]

I am using the Onion Omega 2+

Following Part 1 of the tutorial, I get as far as ubus list -v onion OK, but when I try
ubus call onion omega-led '{"set_trigger":"heartbeat"}', I get the expected response from the terminal but nothing happens on the Omega LED.

[Jeff Larkin]

@Steve-Smythe I'm seeing the same thing. Did you ever find a solution?