Highlight cannot set custom shortcut, macbook

I tried to set a shortcut for highlight, but Obsidian does not have a built-in shortcut.
I use a MacBook m3. I go to settings → keyboard → app shortcuts, then add a shortcut for highlighting.
I see that my shortcut is added to format-> highlight, but it does not work when I press the shortcut. No matter what shortcut I set (e.g., cmd+alt+H, ctrl+cmd+L, etc), nothing happens.
Has anyone had the same issue? Has anyone successfully set up a shortcut?

Shortcuts within Obsidian is set from Settings > Hotkeys inside of Obsidian. Not as generic shortcuts set from System preferences.