SHGetKnownFolderPath usage fails in "NT Service\MyService" account

[HasGen]

I have a service running in "NT Service\MyService" account. I am able to cocreate a COM outofproc server running in the same account. In this COM server I need to make a call : ::SHGetKnownFolderPath(FOLDERID_RoamingAppData, KF_FLAG_CREATE, v, &pszPath); using a NULL token is not working so I have tried to get the token from LogonUser call as :

::LogonUser(L"MyService", L"NT Service", NULL, LOGON32_LOGON_SERVICE, LOGON32_PROVIDER_DEFAULT, &hToken);

But this fails as

Error 1326 = "The user name or password is incorrect."

Any ideas?

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