I am very close in actually closing this post as all relevant information has been provided, FAQ posts have been updated to try and troubleshoot this.
The next step is to work with Polycom support.
This may be a PPI aka a Pay Per Incident ticket so please consider your next steps.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Polycom Global Services
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