Hello thyhk215,
The Polycom CX300 like the CX200 and CX100 is a simple USB Audio Device with no additional features. Itself it will not sign in or out of LYNC as all these actions come from the LYNC Client.
The LYNC Client is provided, supported and maintained by our partner Microsoft®.
The same is accountable for the CX500.CX600,CX700 and CX3000 as they are running a Microsoft provided operating system.
You therefore may want to reach out to the Microsoft® community and / or Microsoft® support directly instead as this is the most direct and efficient path.
Please try here
Best Regards
Steffen Baier
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The title Polycom Employee & Community Manager is a community setting and does not reflect my role. I am just a simple volunteer in the community like everybody else. My official "day" Job is 3rd Level support at Poly but I am unable to provide official support via the community.
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Notice: This community forum is not an official Poly support resource, thus responses from Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge. If you need immediate and/or official assistance please open a service ticket through your proper support channels.
Please also ensure you always check the VoIP , Video Endpoint , Skype for Business , PSTN or RPM FAQ's
