For example, if a user is not authorized to perform an action that he or she has requested,
                 the request returns a  CopyC#
CopyC#Client.UnauthorizedOperation
|  Note: | 
|---|
| Only certain AWS actions return an encoded authorization message. The documentation for an individual action indicates whether that action returns an encoded message in addition to returning an HTTP code. | 
            The message is encoded because the details of the authorization status can constitute
                 privileged information that the user who requested the action should not see.
            To decode an      authorization status message, a user must be granted permissions
            via an IAM policy to      request the  CopyC#
CopyC#DecodeAuthorizationMessage
 CopyC#
CopyC#sts:DecodeAuthorizationMessage
The decoded message includes the following type of information:
- Whether the request was denied due to an explicit deny or due to the absence of an explicit allow. For more information, see Determining Whether a Request is Allowed or Denied in Using IAM.
- The principal who made the request.
- The requested action.
- The requested resource.
- The values of condition keys in the context of the user's request.
 Declaration Syntax
 Declaration Syntax| C# | 
public DecodeAuthorizationMessageResponse DecodeAuthorizationMessage( DecodeAuthorizationMessageRequest request )
 Parameters
 Parameters- request (DecodeAuthorizationMessageRequest)
- Container for the necessary parameters to execute the DecodeAuthorizationMessage service method.
 Return Value
 Return Value Exceptions
 Exceptions| Exception | Condition | 
|---|---|
| InvalidAuthorizationMessageException | The error returned if the message passed to  CopyC# DecodeAuthorizationMessage |