The Oculus Integration package for Unity generates a bunch of warnings when imported into a project under Unity 2018.4. The software should be cleaned up a bit.
In addition, when building cross platform projects, the OVREngineConfigurationUpdater checks the applicationIdentifier no matter the platform and sets it. That's a bug und should only happen on supported platforms and can be handled with a simple directive in EnforceBundleId():

if UNITY_ANDROID