I use code from SDK example:
var boxConfig = new BoxConfig(CLIENT_ID, CLIENT_SECRET, ENTERPRISE_ID, privateKey, JWT_PRIVATE_KEY_PASSWORD, JWT_PUBLIC_KEY_ID);
var boxJWT = new BoxJWTAuth(boxConfig);
var adminToken = boxJWT.AdminToken();

This code - boxJWT.AdminToken() - raise an exception
Additional information: {"error":"unauthorized_client","error_description":"This app is not authorized by the enterprise admin"}

What I doing wrong?