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createKeysAndCertificate 在生产应用程序中停止工作，它工作正常，但突然开始给出状态码为 400 的 UnknownOperationException。请帮助我。这是用于创建密钥和证书的代码。TIA

   Thread(Runnable {

            try {
             

                val createKeysAndCertificateRequest = CreateKeysAndCertificateRequest()
            


                createKeysAndCertificateRequest.setAsActive = true
         

                val createKeysAndCertificateResult: CreateKeysAndCertificateResult

                createKeysAndCertificateResult=mIotAndroidClient.createKeysAndCertificate(createKeysAndCertificateRequest)

          


                // store in keystore for use in MQTT client
                // saved as alias "default" so a new certificate isn't
                // generated each run of this application
                AWSIotKeystoreHelper.saveCertificateAndPrivateKey(certificateId,
                        createKeysAndCertificateResult.certificatePem,
                        createKeysAndCertificateResult.keyPair.privateKey,
                        keystorePath, keystoreName, keystorePassword)


                // loadad keystore from file into memory to pass on
                // connection
                clientKeyStore = AWSIotKeystoreHelper.getIotKeystore(certificateId,
                        keystorePath, keystoreName, keystorePassword)
            


                // Attach a policy to the newly created certificate.
                // This flow assumes the policy was already created in
                // AWS IoT and we are now just attaching it to the
                // certificate.
                val policyAttachRequest = AttachPrincipalPolicyRequest()
              

                policyAttachRequest.policyName = AwsManager.AWS_IOT_POLICY_NAME
                policyAttachRequest.principal = createKeysAndCertificateResult
                        .certificateArn
                mIotAndroidClient.attachPrincipalPolicy(policyAttachRequest)
                Log.i(TAG, "onCreate: attachPrincipalPolicy")

                runOnUiThread {
                    // if(!this.isFinishing && progressDialog.isShowing)
                    //   progressDialog.dismiss()
                }
            }catch ( e:java.lang.Exception){
               Log.e(TAG,
                     "Exception occurred when generating new private key and certificate."+
                       e.message);
            }
        }).start()

这是确切的日志

com.amazonaws.AmazonServiceException:  (Service: AWSIot; Status Code: 400; Error Code: UnknownOperationException; Request ID: 8bc52f99-850a-4d3d-9a50-ad03833)
    at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(AmazonHttpClient.java:731)
    at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:405)
    at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:212)
    at com.amazonaws.services.iot.AWSIotClient.invoke(AWSIotClient.java:11411)
    at com.amazonaws.services.iot.AWSIotClient.createKeysAndCertificate(AWSIotClient.java:1697)
    at com.proj.login.LoginActivity$generateKey$1.run(LoginActivity.kt:496)
    at java.lang.Thread.run(Thread.java:919)
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