I've noticed some of the AK tours (elephant and rhino) do not always open at 60 days. A CM told me to keep looking and at 45 days it opened up for us. Not sure if that applies to Wild Trek tour, but just keep checking if at all possible.
One other thing I tried to see if I was missing something...we are a family of 4, but try 1. If you cannot find a spot for 1 at 60 days, I'd say it hasn't been loaded yet.