Insignia Roku TV and Insignia Sound Bar = No Sound

Mar 23, 2018
Bought at Best Buy:

Insignia™ - 55" Class (54.5" Diag.) - LED - 2160p - Smart - 4K Ultra HD TV Roku TV Model: NS-55DR620NA18SKU: 5679628

Insignia™ - 2.0-Channel Soundbar with Digital Amplifier Model: NS-HSB318SKU: 5809303

Bought on Amazon: AmazonBasics Digital Optical Audio Toslink Cable

I hooked up everything, turned on the Soundbar, no sound. Only coming through the TV so I went into the TV sound settings and turned the TV sound completely off, sound volume up on the soundbar, still no sound via the soundbar. I've never used a soundbar before, so I'm not sure what steps I'm missing.