Voice Chat not mirroring to HDMI when using Controller Mic on console

Bungie Account Name: Spizzo#3646 

Platform: Xbox Series X

Description of Issue: Voice chat audio is not being mirrored to the HDMI output when a microphone is plugged into the controller jack. While playing Marathon, I can see the voice icons moving (showing that teammates are talking), but I cannot hear them through my HDMI setup (HDMI Splitter + Sound BlasterX G6 DAC). The voice chat audio immediately returns to the HDMI output if I unplug the microphone from the controller. This issue is specific to Marathon and does not happen in other titles. Note: The controller is always connected via USB cable.

Rough Date and Time of issue: April 3, 2026 (Ongoing since I started playing).

Repro steps:

1. Use an Xbox Series X connected to an HDMI Splitter/DAC for audio.

2. Ensure the controller is wired via USB.

3. Launch Marathon and join a squad.

4. Plug a 3.5mm headset/mic into the controller jack.

5. Notice that teammate voice audio disappears from the HDMI source.

6. Unplug the mic and notice the audio immediately returns to the HDMI source.