Vizio Smartcast with Polk soundbar.?

I have a busy vizio smartcast tv mounted to the wall. I just got a polk soundbar. I can not get the TV sound to come out of the sound bar. I have put it in the arc hdmi Port. I have it on PCM. Only finds it by CEC not arc but still no sound. Hard to try optical when it's mounted and i can't see the hole.

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