Azure Maps Route Directions API returns NO_ROUTE_FOUND for valid US route while Bing Maps also fails but another map provider routes successfully

Hello @Soluzione Support 2

Thank you for reaching out to Microsoft Q&A and for providing the detailed troubleshooting information.

Based on the behavior you've described, the issue appears to be occurring after successful geocoding but during route generation. In other words, Azure Maps Search is successfully resolving the address and returning a high-confidence result, but the Route Directions service is unable to establish a valid connection between the provided coordinates and the routable road network.

Azure Maps Search and Azure Maps Routing use different underlying datasets and processing logic.

A successful geocoding result indicates that the address can be resolved to a geographic location. However, it does not automatically guarantee that the returned coordinate is directly connected to a car-routable road segment.

When the Route Directions API returns:

{
  "error": {
    "code": "400 BadRequest",
    "message": "Engine error while executing route request: NO_ROUTE_FOUND: No valid route found"
  }
}

it typically indicates that the routing engine could not generate a valid path between one or more supplied coordinates and the supported road network.

Your testing results are particularly helpful because the error consistently occurs between the origin and the first waypoint, which suggests the routing engine is unable to connect the origin coordinate to a routable road segment.

Responses to your specific questions

1. Is this usually caused by waypoint snapping, road-network connectivity, or missing/restricted road data?

Based on Azure Maps routing behavior, NO_ROUTE_FOUND can occur when:

• The supplied coordinate is not sufficiently connected to a routable road segment.

Road-network connectivity is unavailable between the supplied points.

The routing engine cannot establish a valid route for the selected travel mode.

Coverage or underlying road-network data limitations exist for the affected area.

While we cannot conclusively determine the exact root cause without reviewing the affected coordinates, the symptoms you described are consistent with a road-network connectivity or routable-point issue rather than a geocoding issue.

2. Is there an API-supported way to obtain the closest car-routable coordinate?

Yes. Azure Maps provides the Snap to Roads API, which is specifically designed to align coordinates to the nearest road network and can be used as a validation step before route calculation. The API returns points snapped to existing roadways and can help identify whether a coordinate can be associated with a drivable road segment.

Please refer this Microsoft Documentation

Azure Maps Snap To Roads API: https://learn.microsoft.com/rest/api/maps/route/post-snap-to-roads

3. Are Search API entryPoints always expected to be routable?

No explicit Microsoft documentation guarantees that every geocoded coordinate or entryPoint returned by Search will always be routable for automobile routing.

A location may be successfully geocoded while still not producing a valid route due to road-network connectivity, access restrictions, or routing-data limitations.

Therefore, successful geocoding should not be interpreted as a guarantee that Route Directions will always return a valid driving route.

4. What fallback approach is recommended?

For production scenarios, we generally recommend:

Geocode the address using Azure Maps Search.

Validate or normalize coordinates using the Snap to Roads API.

Submit the snapped coordinates to Route Directions.

If routing still fails, implement application-level fallback handling (for example, manual review, alternate coordinate selection, or alternate routing logic).

Using Snap to Roads before route generation can help identify situations where a geocoded coordinate cannot be associated with the road network.

5. How can affected addresses be shared privately?

Since the affected locations contain customer information and should not be posted publicly, we recommend opening an Azure Support request and providing the impacted coordinates, sample requests, timestamps, correlation IDs (if available), and expected routing results through the support case.

This allows the Azure Maps engineering team to investigate the specific locations and determine whether the issue is related to routing data coverage, road-network connectivity, or a service-side routing anomaly.

To help narrow down the issue, we recommend testing one of the affected origin coordinates with the Azure Maps Snap to Roads API first. If the coordinate cannot be successfully snapped to a drivable road segment, that would strongly indicate the source of the routing failure.

If multiple customer locations are affected and the issue has business impact, please open a support case and provide several representative examples so the Azure Maps team can perform a deeper investigation against the underlying routing dataset.

Please refer this

Azure Maps Route Directions API: https://learn.microsoft.com/rest/api/maps/route

Azure Maps Snap To Roads API: https://learn.microsoft.com/rest/api/maps/route/post-snap-to-roads

• Azure Maps Routing Coverage: https://learn.microsoft.com/azure/azure-maps/routing-coverage
• Choose between different routing APIs (best practices overview): https://docs.microsoft.com/azure/azure-maps/how-to-use-best-practices-for-routing#choose-between-route-directions-and-matrix-routing
• Azure Maps Route Directions / REST guidance via migration article (Route Directions purpose and request/response mapping): https://learn.microsoft.com/azure/azure-maps/migrate-calculate-route
• Azure Maps Routing client library troubleshooting note on routing input errors (HTTP 400 when wrong points are passed): https://learn.microsoft.com/dotnet/api/overview/azure/maps.routing-readme?view=azure-dotnet-preview&wt.mc_id=knowledgesearch_inproduct_azure-cxp-community-insider#troubleshooting

I hope this helps clarify the behavior.

Thank you!

Additional investigation update:

We performed further testing based on the recommendation to use Snap to Roads and Route Range.

1. Snap to Roads was successful for the origin coordinate. It snapped to a street and returned speed limit information.

Snap to Roads was also successful for the destination coordinate.

However, Route Directions still returned NO_ROUTE_FOUND even when using the snapped origin and snapped destination coordinates.

We then tested Route Range from the snapped origin coordinate with travelMode=car and a 10 km distance budget.

Route Range returned only a very small local reachable boundary around the origin, with several repeated boundary points at the origin coordinate.

We then tested routing from one of the Route Range boundary points to Louisville, and Route Directions still returned NO_ROUTE_FOUND.

Based on these results, it appears that Azure Maps can recognize and snap the origin road segment, but the local road network around snapped street appears to be disconnected or isolated from the wider car-routable road network in Azure Maps routing data.

This does not appear to be a geocoding issue, API formatting issue, or simple coordinate snapping issue. It appears to be a routing-network connectivity/data issue.

This has business impact for us because our application depends on Azure Maps Route Directions API for distance calculation and routing validation. We are seeing similar issues for other valid addresses as well.

Please advise how this routing-data issue can be escalated for correction, and whether Microsoft can provide an expected resolution path or a recommended production workaround for valid addresses where Snap to Roads succeeds but Route Directions still cannot route out of the local road network.