UE4 4.27 - Oculus audio plugin not loading - Spatializer not initializing

When trying to run our built 64 bit binary we get an exception thrown in FOculusAudioPlugin::StartupModule. Continuing after this exception results in OVRPlugin.dll being loaded but not ovraudio64.dll. After this we get an exception in FOculusAudioContextManager::CreateContextForAudioDevice firing every frame because it can't load the audio dll. In the editor, the audio plugin loads just fine. It's just in a built binary that it fails. 

Everything appears to be configured correctly in the unreal editor with respect to loading the Oculus Audio plugin. We're not sure if OVRPlugin.dll loads ovraudio64.dll or if they are both loaded independently by the engine. Anyone have any insight that might be helpful?