PFX 证书在Windows 8 Store APP 中不工作

[libaozhen1208]

我的APP 需要调用一个远程 web service，service的验证使用的的是证书验证，在调试模式下工作正常。
一旦把app通过visual studio 2013 打包成package，然后用PowerShell 脚本安装，安装以后访问service失败，证书没有起作用。
证书调用过的相关代码如下：劳请各位大哥大姐，爷爷奶奶给点提示，或者帮助，谢谢！

string certRawData = StringEncryptionHelper.Decrypt(ConfigurationLoader.ApplicationSettings.CertificateData.RawData);
string certPassword = StringEncryptionHelper.Decrypt(ConfigurationLoader.ApplicationSettings.CertificateData.Password);

await CertificateEnrollmentManager.ImportPfxDataAsync(certRawData,
    certPassword,
    ExportOption.Exportable,
    KeyProtectionLevel.NoConsent,
    InstallOptions.None,
    ConfigurationLoader.ApplicationSettings.CertificateData.FriendlyName);

CertificateQuery certQuery = new CertificateQuery { FriendlyName = ConfigurationLoader.ApplicationSettings.CertificateData.FriendlyName };
IReadOnlyList<Windows.Security.Cryptography.Certificates.Certificate> certs = await CertificateStores.FindAllAsync(certQuery);

certificate = certs.FirstOrDefault();
var protolFilter = new HttpBaseProtocolFilter { ClientCertificate = certificate };
var client = new HttpClient(protolFilter);
HttpResponseMessage result = await client.GetAsync(requestUri);