Teams Bluetooth Audio Stack - Headphone vs Headset Failure

Been having a strange issue since the latest update on New Teams (1st Oct 2025 updated).

This only happens with Bluetooth and with Headsets like PLT Voyager Legend and Yealink BH71 and on Windows 11.  Mobile phone Teams works fine and to be clear, all other apps work fine with the Headsets.  Its ONLY Teams doing this, and onluy since this update - worked perfectly for years before.

When my device is connected Teams is separating the Speakers as Headphone and the Mic as Headset.  This now means that when using the Mic, it won't play audio through the headphone (speaker) and vica versa when using the speaker (headphone) it won't allow the Mic (headset) to be used.

This is a MASSIVE regression and extemely frustrating for any mobile user.  I thought this was a PLT issue, so I bought a brand new Yealink BH71 and connected it via bluetooth and it did exactly the same thing.

To be clear, this was working perfectly for months and years before this latest update.