As we had questions on this before I simply created an FAQ:
Jul 31, 2020 Question: How can I troubleshoot a phone not getting an IP or DHCP issues?
Resolution: Try a manual IP => here <= or for DHCP logging check >here< and check LLDP or CDP => here <=
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
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