401使用SharePoint CSOM ClientContext和OAuth的未经授权的错误

尝试从winforms应用程序向SharePoint Online（通过ClientContext）进行CSOM调用时遇到问题。我的环境具有与Office 365通信的Active Directory联合身份验证服务服务器。 

I have been having problems attempting to make CSOM calls to SharePoint Online (via ClientContext) from a winforms application. My environment has an Active Directory Federation Services Server in communication with Office 365. 

我正在使用ClientId，Client Secret和TenantId创建ClientContext;换言之，高信任情景。我一直在使用Fiddler观察消息流量。

I am creating a ClientContext using the an ClientId, Client Secret and TenantId ; in other words a high trust scenario. I've been using Fiddler to watch message traffic.

创建上下文时，我按预期收到了一个Bearer令牌。但是每当我使用上下文进行呼叫时，我都会收到401个未经授权的响应以及一些额外的错误消息：

When creating the context I receive a Bearer token as expected. However whenever I make a call using the context I keep getting 401 Unauthorized responses with some additional error messaging :

x-ms-diagnostics：3000006; reason =" Token contains无效签名";类别"invalid_client"

x-ms-diagnostics: 3000006;reason="Token contains invalid signature"; category"invalid_client"

响应正文显示"不支持的安全令牌"。

the body of the response says "Unsupported security token".

事情就是这一切都正常几个星期前，在新的一年之前，它突然停止工作，我一直无法找出原因。

The thing of it is this was all working fine several weeks ago, before the new year, and all of a sudden it stopped working and I've been unable to figure out why.

谢谢