Lifx and smartlighting not working

Yes, inevitable. But there is still time to go with the Classic app.
And honestly, I would be surprised if the Smart Lighting would be phased out. As it is a piece of SmartApp which is actively developed/fixed. And currently the only way to run any automated stuff locally on the hub, of course if all devices in the setup run locally too.

So, you say, motion sensor trigger is not turning on and off the LIFX bulbs.

There was another topic about a same issue a few days ago.

Which LIFX bulb type? Mini?

@metalp3n have you tried to trigger the LIFX bulbs with motion in Smart Lighting?