Some have the TV set to source sound from other than HDMI. Some TVs can't decode the audio and some folk post but omit they have some soundbar or other over Optical or other audio connections.
Remember folk, always tell what all the model numbers are and the connections.
HDMI does not mean it just works. Sometimes you have to go over the settings with a fine tooth comb.
Also try the player set to Stereo or PCM output.
I have a problem I have a Panasonic blu-ray player on my Samsung 40 inch Smart TV 4K UHD series 7. Trying to play a Blu-ray movie the picture is great on it but there is no sound what could be causing this? I also have a toshiba DVD player with video audio cable not HDMI The picture and sound work great. Do not understand why I cannot get the sound to work on my Blu-ray player that has a HDMI Port.