Additionally, try connecting another device you know for sure works. It may not even be your Vizio TV that's the problem at ...

Power Cycle Your TV: Unplug your Vizio TV from the power source, hold down the physical power button for at least 15-30 seconds to drain any residual power from the capacitors, and then plug it back ...

Unfortunately, it doesn't always work the way it should right out of the box, and when that happens, you'll have to do a little troubleshooting to get the subwoofer to pair with your Vizio soundbar.