That's great that you got an appointment
We were too nervous to register for the account you need to schedule after fiance went to his medical appointment because it asked us to certify that we had received the packet from the immigrant visa unit. We read some older threads saying embassies/consulates were canceling interviews that were scheduled too close to petitions arriving at the immigrant visa unit.
Kind of wish we'd just went for it because there haven't been any openings 😕 I'm guessing they were canceling those during covid.