MacBook Pro will not detect external speakers, even though it did yesterday

I have a MacBook Pro and it is connected to my HDTV via an HDMI cable and adapter. Yesterday my laptop was able to detect the external speakers in the TV and sound was coming out of my tv from my mac. But today my mac isn't detecting the external speakers and no sound is coming out of my tv. I've tried turning things on and off in multiple ways. Unplugging and replugging the HDMI cable/ adapter. Both of the cables are plugged in properly. Whenever I go to System Preferences>Sound>Output my external speakers aren't showing up. This is so annoying, help me please! Thanks.

I had this problem, too for my 2014 MBP. The output speakers did not show up when I tried to connect through the HDMI port. However, the output speakers did show up when I used an HDMI to Thunderbolt cable.

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