No change in resistance in indoor mode with Wahoo Kickr

Just got the 1040 unit (upgraded from Edge 500!) and getting my head around the various features.

I noticed that when I try to ride a previous route the unit does not change the resistance on the Kickr, and although the elevation chart on page 1 shows variation, there is a flat line on the elevation page and there is no change in resistance at all. Tried several routes, same outcome.

Im also a little confused by the 'navigate to start of course' pop up option at the start of the ride, given this is indoor and I turned off the GPS function.

Any help welcomed! The ability to train and ride indoors to improve particular aspects of my ride is a big reason why I bought this unit. It would be such a disappointment if I cant get this to work.