Applies to Launchkey Mini Mk3
Please first update your firmware using Components.
By default, the Launchkey Mini Mk3 should be autodetected by Ableton Live 10.1.1 and later.
If this does not work, or you have changed the settings, these are the settings to revert back to:
Note that on Windows systems the second port will appear as Launchkey Mini MIDI IN2
You'll know that the Launchkey is working with Live when you see Session pad light up when you hold down shift, or when the pads reflect the session mode behaviour, like in the image shown below: