The MAC address provided is the -025 and as long as you do not have proof of purchase for the Polycom license this may be the same for all your phones.
Please sort out the licenses as this pays for Polycom's development to enable the Skype for Business compatibility.
Once you have this please work with the reseller already mentioned to work on a ticket.
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