What are the possible causes and solutions for the lack of audio output from a koorui monitor 24e3 connected via display port?

 
I have a koorui monitor 24e3 that I use with my GPU through a display port cable. I have set the monitor volume to the maximum level and checked the sound settings on my computer, which show a green indicator when I play any audio. However, I cannot hear any sound from the monitor speakers. How can I troubleshoot this issue and fix it? I appreciate your help.
 
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