This is the same as calling RegisterService(String, Identity, ServiceRegistrationOptions) with null ServiceRegistrationOptions.

Attempts to register the service and blocks until the service is either registered successfully or has failed to be registered.

This method does not return until a SERVICE_STATUS event has been generated. Note that if the session was created in asynchronous mode, the event may be processed before the function returns.

When providerIdentity is null the session identity will be used if it's been authorized.