Why wont my wired headphones work?

Why wont my wired headphones work?

So basically I have a pair of RUNMUS headphones that are wired. I have connected them to other things so I know it isn’t a problem with them. Second, I tried a pair of my Bluetooth headphones but no sound. I have a Benq monitor with built-in speakers and those are the only things that will play audio. How can I make it to where my wired headphones play the audio? I have tried this guide but it hasn’t worked. https://www.techbout.com/headphones-not-...