Hi Crazy Cat,
Since our case is still on the process of going to the NVC, do we contact the embassy already? According to the second bullet point of the screenshot below, if our petition is being processed at the NVC, we should contact the NVC to request transfer. However, I don't fully understand the third bullet point which is saying to contact the embassy which is opposing the second bullet point.
https://travel.state.gov/content/travel/en/us-visas/immigrate/national-visa-center/immigrant-visas-processing-general-faqs.html#ivp13