I can not get my headphones to work in Halion7 without an audio interface. (It is the same in Kontakt 8 and g-player and I have a Lenovo win 11 laptop.)
The headphones work with youtube. And also with an audio interface in Halion 7.
In Halion 7, open the Settings (little cog-shaped button near the top right corner just left of Volume). Go to the ASIO Driver and Outputs tabs and set the driver and audio outputs - the settings will be specific for your laptop.
The driver and outputs need to be set specifically for whichever output you’re using at the time (audio interface or laptop sound).
Paul