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Found this by doing a simple Google search for "Amazon Basic Soundbar Comcast Remote code", looking at the question and answers on the Amazon website and seeing what another poster replied with.
"For my Xfinity Voice remote, I used the guided setup and chose Vizio as the Audio Device brand. The code I used that works was 32454"
I hope someone can tell me how to find a audio device code for the XR15, there is no listed one. my device is an amazon basic soundbar
Did you try this?