DBUS_SYSTEM_BUS_ADDRESS not working

Hi,

trying to run mmcli from an application but I’m getting stuck with the following error:
error: couldn't get bus: Could not connect: No such file or directory

I’m setting export DBUS_SYSTEM_BUS_ADDRESS=unix:path=/host/run/dbus/system_bus_socket on the script calling mmcli

Tried 3 images so far, all with same result:
resin/raspberrypi3-alpine
resin/raspberrypi3-debian
resin/raspberrypi3-python:slim

Thank you!