Appointments - specify one service and one provider for booking

I want to create a booking page that displays only one service and one service provider. Found this shortcode [app_service_providers service="3"] on this thread - https://premium.wpmudev.org/forums/topic/adding-a-schedule-for-a-specific-service-to-a-page
Works but only shows the same service- the first service, even with different 'service="n"'