I see a spot in your TV manual that says "Dolby Digital only available when tuned to a Digital RF channel".
that makes me think that the TV won't pass Dolby Digital (common in some older TVs).
The option to fix this is pull the optical direct from the HDMI instead of the TV.
Adapter like this:
https://www.amazon.com/ViewHD-Extractor-Optical-Toslink-Converter/dp/B00KBHX072
Then you can connect the optical cable there instead of to the TV itself.
If you have more than one HDMI device you would need a switch so you can hook all your HDMI devices to it.
Like this:
https://www.monoprice.com/product?p_id=15375
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