windows 10 – How to troubleshoot bluetooth audio for a Surface tablet?

From bluetooth settings (start ms-settings:bluetooth) clicking disconnect and connect generates an audible pairing message from the headset.

Hower, youtube or other video only seems to play over the built-in audio.

One time zoom worked.

The PLT v5200 from plantronics works with other devices.

Not sure what I can do. I removed the device and re-added it.

I removed the device from bluetooth.

Added an Alexa speaker. YouTube plays fine over the Alexa speaker.

Disconnected from the Alexa speaker.

Connected to the 5200 earpiece.
Audio still plays over the built-in speakers.

In bluetooth settings, it now shows as:

Connected voice

which is probably the problem.