Purchased a Caseta Wireless plug in lamp dimmer (Lutron PD-3PCL-WH) and cannot get the device to pair with a pico remote. The instructions state to simply hold the off button on the dimmer for six + seconds until the LED blinks then repeat on the pico remote. Holding down the off button, the LED will only stay solid and not blink, LED goes off once released. Tried numerous times to pair without success. Is the device defective? Not trying to use a hub or app, just wirelessly controlling one lamp with a pico.