RX-V365 doesn't support HDMI audio. You need to connect the cable box also via spdif cable for audio to work. Look at the box if it uses optical spdif or coax spdif. If optical, you see that optical input on receiver is named DTV/CATV, so use also DTV HDMI for video. Coax spdif is named DVD, so in this case you will need to use DVD HDMI input.
Also you need to configure the inputs accordingly.
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