reasonCode 
  The reason code. Available only if a connection is not found.
- BLACKHOLE_ROUTE_FOR_DESTINATION_FOUND- Found a black hole route with the destination CIDR block.
- CYCLIC_PATH_DETECTED- Found the same resource multiple times while traversing the path.
- INACTIVE_ROUTE_FOR_DESTINATION_FOUND- Found an inactive route with the destination CIDR block.
- MAX_HOPS_EXCEEDED- Analysis exceeded 64 hops without finding the destination.
- ROUTE_NOT_FOUND- Cannot find a route table with the destination CIDR block.
- TGW_ATTACH_ARN_NO_MATCH- Found an attachment, but not with the correct destination ARN.
- TGW_ATTACH_NOT_FOUND- Cannot find an attachment.
- TGW_ATTACH_NOT_IN_TGW- Found an attachment, but not to the correct transit gateway.
- TGW_ATTACH_STABLE_ROUTE_TABLE_NOT_FOUND- The state of the route table association is not associated.