Note 8 – no audio when connecting cellphone to TV through HDMI cable

I purchased the proper Samsung-branded USB-C to HDMI cable as a way to mirror my cellphone display and audio on the TV at my AirBnB whereas on vacation. I used this efficiently on each my Galaxy Note 10 and my Galaxy Note 8 – audio and video each labored. That TV was a Smart TV, however not a Samsung. Now I’m again dwelling with my non-smart TV, and the cable works high-quality with my Note 10, however I can not get audio from my Note 8. The display mirrors high-quality, however when the HDMI cable is related, there isn’t any audio from both the TV or the cellphone itself. When I change to Samsung Dex, the audio does come by way of the cellphone, however not by way of the TV. The drawback is that I can not resize the app to fullscreen when utilizing Samsung Dex, so I’d relatively simply use display mirroring. Any answer as to how I can get the audio to work? Thanks.