No Turn-by-Turn instructions on some routes.

• The selected routing

  
  When you create a route, you can choose a specific routing. With that routing, the path is calculated across the available road and path network. Based on the link to that network, instructions are generated. Those instructions indicate things like "diagonally right on Brueghel Avenue." Almost all routing options do this.

    There is, however, one exception:"manual". In that case, you deliberately choose NOT to match to the underlying network nor are instructions computed on the underlying network. You only get instructions along the viapoints and no street names are mentioned then. The TBT instruction then depends on how accurately the route was plotted on top of the streetmap.  
  
   Read more about "manual" here.

   

• An uploaded route
  
  You can also upload a route (e.g.a gpx) on RouteYou where you get the choice not to have the route recalculated and therefore also NOT to be matched with the underlying network. In that case, you won't get any instructions either. 
  
   Read more about it here.
  
  

• a recorded route
  
  With a recorded route no instructions appear by default because no link is made to the underlying road and path network
  
   Read more about it here.

• Deviating geometry
  
  If you look closely at the geometry, you will see that in case of manual routing or uploading without matching with the network, the geometry differs from the roads and paths on the underlying map (see example below).
  
  
  
  
• Printing the roadbook
  
  If you print the roadbook ,you will normally get a list of instructions. If there is NO match, you will not see any instructions.
  View a sample route (select the print option) and have a look at:
  (Kies "afdrukken" > "roadbook")
  
  • a roadbook with instructions
  • a roadbook without instructions
    
    

Option 1: It is your own route

Yes, for sure. If it is your own route, you can edit the route using the route planner.
 Read more about it here.

• The routing in the planner will be set to "manual".
• Change it to OSM shortest or another routing
• At the question "To what do you want to apply this routing? A: "Full route" or B: "Next changes", choose A. The full route will then be matched with the underlying network. And instructions will be calculated.
  
  

Option 2: It is a route of someone else

1. Download the GPX of the route
    Read more about it here.
2. Load the GPX and choose the default options with "Recalculate on existing roads where possible".
    Read more about it here.