I'd also like to know what's going on with the SFO office. I recently applied for renewal for my family of 4, and my wife and son were fully approved while my daughter and I need interviews. Her conditional approval came thru earlier and I was able to schedule an interview for her at SFO in early Jan 2020. But now for me all I see is "no appointments available for this location". Thought about trying walk-in but according to Yelp the SFO office doesn't accept walk-ins anymore. This will be very frustrating if the SFO office has really stopped all interviews.