After many many further unsuccessful attempts, I thought I’d use a USB mic just to workaround the issue for now. Turns out that the MyCroft image doesn’t pick up on USB devices (at least both my mic and my phone).
I’ve also installed a vanilla Ubuntu on the Dev Kit. Then, the USB devices work, but I have no clue how to set up the daughter board. So, no speakers and no microphone.
So yeah, I am completely confused now. Does Mycroft block USB devices? Why?