I have a brand new Garmin 1040 Solar and have a few issues I am trying to iron out.
I am in the thick of Winter and ride indoors, I use Zwift and like to do other things to break the monotony of indoor training, so I like the "Follow a Course" option on my Garmin 1040 Solar. I have it paired with a Wahoo Kickr v5 ... both are up to date and the trainer is paired as a smart trainer, no other connections are established.
I select "Follow a Course" and load a favorite course that I created in Garmin Connect and start riding, I get to a hill that is around a 6-10% gradient and there is no change in resistance on the trainer. I then tried to manually adjust it, same outcome. So I am essentially just spinning at this point.
I also have 1030, it is the same connection and the "Follow a Route" function works perfectly, I, unfortunately, sold it a week ago.
I have spent a lot of time troubleshooting all I can from Wahoo's side and everything is functioning properly there.