I want to use Japanese location name for Bing maps - Get route action.

In this case, Waypoint 2 = '大阪駅'.
The result is error.
errorDetails": [
"One or more locations specified in the waypoint parameter are invalid or require more information.",
"大阪駅"
],
In using English location name 'Osaka station' of '大阪駅',
The result is good.

and, I can use Japanese location name in Bing Maps Web site.

So, I want to know How can I use Japanese location name for Bing maps - Get Route action.
Regards,
Yoshihiro Kawabata