in the meantime I want to give you a feedback after months. The workaround provided by Poly about disabling Intel Smart Sound Technology driver is still valid and it works perfectly, but there is a problem: quite often (I'm not 100% sure, but I could say "always") after laptop reboot, the driver re-enables again and you need to disable it and then rebooting again to have BT600 working as expected. It's quite annoying and honestly, very frustrating.
I cannot imagine Poly cannot manage this in a different way. I've used another bt headset from a different vendor, without any problems for months.
Please please fix it definitely!!!
welcome back to the Poly community.
Is the other vendor's headset you successfully used also using a dongle?
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I had the same issue and it was linked to Intel Smart Audio driver getting in the way.
Hope this helps