Raspberry Pi 4's don't work with kids' headphones

I haven’t figured this one out yet, but for some reason kids headphones don’t seem to work with the Raspberry Pi 4, volume is extremely low like the jack isn’t making the right connection. Might be the number of poles on the connector?

Turns out the solution was to launch alsamixer from the terminal, hit F6 on the keyboard, select a different output, and turn up the volume.