Also successful with ddhifi TC05 type c to type c otg cable to the ddhifi TC28i lightning to usb c adapter
(maybe easier to source / buy together)
tried iphone SE and ipod touch 6G.
Key point. Turn off. Plug in. Turn on. Input (bt off).
Two lights on the left should show
I could only locate one usb-c to lightning cable (in one). And that did not work.
i think i have others in the house...somewhere...
Anyway - one result is that the CCK isn't needed.