VRP - MaxOrderCount Limt of 1,000?
Conclusion:
The VRP REST API runs off of the ArcGIS Online VRP service which is where the 200 max order count that you are seeing is imposed.
The 1000 max order count that was being referenced above is for using the ArcMap tool with a local network dataset or through the equivalent GP tool (not the ready to use service).
The VRP solver is designed for delivery scenarios where stops are spread over an area. It was not designed for arc-routing applications such as residential trash collection where every house on the block is being routed to. You can reduce the density of stops by aggregating the stops to one per edge or one per side of edge and use the VRP solver. Or you can use the Route solver to optimize one route at a time with more than a 1000 stops.
Use ArcGIS Pro 2.4 and the Route solver with the Find Best sequence option. It does not have a limit on the orders per route and It will solve much larger problems more quickly. For example I solved a 2000 census tracts locations in LA in about three minutes and 6000 locations in about a half hour.