Check both ends
Start with the exact PC and headset model documentation. A broad Bluetooth marketing label does not describe every audio capability. Record the headset firmware and the PC’s supported Bluetooth and audio-driver package.
The Windows LE Audio switch is useful host-side evidence, while the headset specification is device-side evidence. Neither alone proves the active connection has the feature you want.
Look for the microphone-active format
Connect the headset and open its Windows output settings. The microphone-active format is a separate observation from the basic LE Audio switch. Enter what you actually see in the checker rather than choosing the option you expect.
The stereo feature has a later Windows build baseline and additional hardware requirements. A software update can satisfy a software prerequisite without changing incompatible hardware.
Confirm behavior in the intended app
After changing a supported setting, reconnect and test in the app you plan to use. If stereo produces interruptions and Windows offers mono, compare that option. Preserve accessibility settings that you rely on; stereo is not automatically the right choice for every listener.