3 Way Switch Wiring Diagram Micro. Connect Common from the left switch to the second point on the Aeon control. The electricity source and light fixture are connected to the same switch.
So what you should see if you have the correct 3-wire electrical cable Romex is a black power white neutral and now a 3rd Red wire. Connect the Line brown wire coming from the light together with the 3 CoreEarth cable black wire in to the L1 terminal of the two-way switch. There is a way to wire this but unfortunately it involves re-wiring at the light.
Refer to the above 3-way switch diagram.
The white wire becomes the energized switch leg as indicated by using black or red electrical tape. Take a closer look at a 3 way switch wiring diagram. Connect Common from the right switch I think it is black on the pic to Aeon control. Better yet apply Mike Maxwells hack to the switches converting toggles to momentary and disconnect black from 3-wire cable from everything.