Question connect insignia NS-SBAR21F20 to Samsung UN40H5203AF TV

Dec 4, 2020
I am having trouble connecting an insignia NS-SBAR21F20 to a Samsung UN40H5203AF TV. I am using the included RCA cable, would getting the digital optical cable fix this? And just to be clear, yes I went into the settings on the tv, changed the audio output from tv speakers to audio out. Also, I can connect to the sound bar through blue tooth on my phone, no problem. We mostly watch everything on the TV through a small roku device, no audio connections on it, it's connected to the TV through an HDMI cable
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