This seems to be an issue for all K1 visa appointments. We were told to schedule an interview on the Embassy's prior vendor site (ustraveldocs) but we were unable to schedule an appointment. We paid an agent in Nigeria before the vendor changed to help secure an appointment and were told they were not working on K1 visas yet and once they were be would secure an appointment. Then the embassy changed to the new vendor site on August 26. The new vendor AVITS is not even showing our prior application or Case ID despite having Connors our DS-160 & paying our MRV fee.The instructions were unclear in the new Applicant Visa Information Tracking System (AVITS) site so I created a new profile because the old one didn't work. We then received an email to activate the new user account. Using the link, our old info wasn't there and our case ID didn't work. The service center said we received the wrong link since we already had an account on the prior vendor site. Since that date, we've received no further emails or a timeline when the old account will be merged with the new account. Our agent has no new details and is saying to wait. So frustrating! If anyone has insight can you please respond and advise.