To get turn-by-turn from RWGPS you have to create the route in RWGPS and sync your Wahoo Fitness account with RWGPS.

I think the same process applies to Komoot but I've never tried it.

If you create a RWGPS route, download it, and manually upload it to your Wahoo the turn-by-turn won't work. You have to sync your accounts.

It works with the free RWGPS app, but I think you have to manually create the route in RWGPS. I'm not sure.

Also, Wahoo Support is pretty responsive.