Lync says call was not transferred

Hi,
I have this error when I want to transfer a call even the audio device is set up to accept calls. I don’t know how to make Lync to recognize my speakers and solve this ? Can anyone help me please to fix this ? Why this program gives me this error ?
Thank you !

Lync
Cannot complete the transfer.
Call was not transferred because **** does not have an audio device set up to accept calls.
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