Headset mic doesn't work with L5

I’ve tried attaching my headset to the librem 5 (via the headset jack), and it doesn’t seem to be able to get anything from the mic. This same headset works on my laptop and pinephone, so I’m sure the headset itself is functional.

When I plug it in, the L5 doesn’t switch to the headset for it’s mic setting. Switching to it in the sound preferences makes it so I get no audio from the mic. The kill switch is on, and I’ve tried rebooting with that switch on to no change.

Is this a known issue?

Looks like it: Wired headset microphone not recognised