the VVX1500 has certain limitations in regards to the BLF.
It does not support Enhanced BLF (eBLF) or Static BLF (sBLF).
UCS 3.3.2 is a rather old software and you should test against UCS 3.3.5 if you want to stay on this older version.
The UCS 4.0.4 release notes mention:
76123 All the buddies added on the phone are now displayed on the phone's home screen by pressing the More soft key (applies to VVX 1500).
In order to cross check any issues you should work with your Polycom reseller and/or Polycom support.
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