Bug Vivox error: Unable to load DLL 'VivoxNative'

I am building a Unity app using the Unity Multiplayer services for the Hololens 2 using MRTK2. I currently have a working Vivox test implementation in my code that allows me to join an echo channel to test the feature within the build. This works fine in the editor. However, when building to the Hololens 2, when it calls VivoxService.Instance.Initialize(), I get the following error.

Vivox error: Unable to load DLL 'VivoxNative'/ Tried to load the following dynamic libraries: Unable to load dynamic library 'VivoxNative' because of 'Failed to Open the requested dynamic library (0x06000000) - The specified module could not be found. (WinError: 126/0x0000007e)

Is this due to something missing in my install, or is this an imcompatibility/issue in Vivox itself?

I am building for UWP for the Hololens using ARM 64 with D3D. My Unity version is 2021.1.17f1, and my Vivox version is 15.1.200000-pre1 - March 24, 2023.