[当使用MSAL库为后台控制台应用程序使用client_credentials生成访问令牌来调用两个REST端点时，get令牌调用将创建为：
client_id=XXX&client_info=1&client_secret=XXXX&scope=api%3A%2F%2FMyService-DevBlr-ClientServices%2F.default+api%3A%2F%2FMyService-DevBlr-CoreServices%2F.default&grant_type=client_credentials
并发布到
https://login.microsoftonline.com/a1326aec-378e-4433-8e2a-67a086554fc8/oauth2/v2.0/token
响应是一个400错误：
{"error":"invalid_scope","error_description":"AADSTS70011: The provided request must include a 'scope' input parameter. The provided value for the input parameter 'scope' is not valid. The scope api://MyService-DevBlr-ClientServices/.default api://MyService-DevBlr-CoreServices/.default is not valid.\r\nTrace ID: 203ad632-5e7c-4e61-9dcd-185eb9b49200\r\nCorrelation ID: 99fd979a-2c11-485b-ba14-c0cad3312e02\r\nTimestamp: 2020-01-11 08:36:29Z","error_codes":[70011],"timestamp":"2020-01-11 08:36:29Z","trace_id":"203ad632-5e7c-4e61-9dcd-185eb9b49200","correlation_id":"99fd979a-2c11-485b-ba14-c0cad3312e02"}
当传入单个范围时，调用可以正常运行：
Request:
client_id=XXXX&client_info=1&client_secret=XXXX&scope=api%3A%2F%2FMyService-DevBlr-CoreServices%2F.default&grant_type=client_credentials
Response:
{"token_type":"Bearer","expires_in":3599,"ext_expires_in":3599,"access_token":"eyJ0e..."}
和
Request:
client_id=XXXX&client_info=1&client_secret=XXXX&scope=api%3A%2F%2FMyService-DevBlr-ClientServices%2F.default&grant_type=client_credentials
Response:
{"token_type":"Bearer","expires_in":3599,"ext_expires_in":3599,"access_token":"eyJ0eX..."}
文档和API支持scopes数组：https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/wiki/Client-credential-flows#code-snippet
将单个令牌与多个服务调用一起使用会很有好处，但是我似乎无法正常工作。任何建议表示赞赏。