The Renoir II line of lighting controls will not operate like a standard 3-way light switch, or even a traditional 3-way electro-mechanical dimmer. For true 3-way dimming (brightness control from multiple locations), you need a digital control. To set up a multi-location control in a system like this, there is only one load-bearing device. In your case, the AWSMG-IDW. For the control in the other location, you cannot use another dimmer, you would need a dimming remote switch, also known as a slave switch. The proper remote switch for your needs would be the AWSRG-00W.
The yellow traveler wire in these controls don't pass line voltage to the other devices in the circuit, they merely act as a communications line for ON/OFF, BRIGHTEN/DIM messages. Please refer to the instruction sheet that came with your dimmer for more detailed instructions and wiring diagrams.