We have this exact setup. I assume you've "connected" komoot and your wahoo? if so, then go to the "maps" page on your wahoo and press the "sync" button. YOu'll need to be on wifi or connected to your phone for the sych to work, it takes a minute or so and then the route will show up on the list of your wahoo. There's a limit to the number of routes which show up so I generally call up the route in komoot, then exit and hit sync on the wahoo. Works very reliably! Glad to answer any questions.