Headphone audio on LG monitor no more

I have an LG 24ML44B that I use as a second monitor. Previously, in Windows 10, I was able to use the headphone audio output on this monitor to listen to the incoming audio of Zoom calls. Note: I use a Soundblaster USB for the main audio for the computer. Same computer, same setup, but now on Windows 11, and the LG monitor doesn't even appear as an option in the "listen to this device with" setting. And I don't see it in the Device manager.