Try just leaving it on for at least 5-10 minutes, and also make sure you press the OK button on the screen that first appears, as the car won't connect to Nissan servers until you do.
I had a lot of trouble getting past this step on my car too and from memory the issue was turning it off again too soon. (Despite the instructions to do so)
Check on the map screen that you have a car symbol in the top right corner with a signal - this is a sign that it is connected to the nissan connected services server. This can sometimes take 2-3 minutes if the mobile signal in the area is weak or slow (It only uses 2G GPRS!) and until it connects there will be a red cross.
I had a lot of trouble getting past this step on my car too and from memory the issue was turning it off again too soon. (Despite the instructions to do so)
Check on the map screen that you have a car symbol in the top right corner with a signal - this is a sign that it is connected to the nissan connected services server. This can sometimes take 2-3 minutes if the mobile signal in the area is weak or slow (It only uses 2G GPRS!) and until it connects there will be a red cross.