Oauth in Sandbox Not Working

[Stewartarmbrecht]

I am trying to use this code:
Uri userStoreUrl = new Uri("https://" + evernoteHost + "/edam/user");
TTransport userStoreTransport = new THttpClient(userStoreUrl);
TProtocol userStoreProtocol = new TBinaryProtocol(userStoreTransport);
UserStore.Client userStore = new UserStore.Client(userStoreProtocol);
var authenticationResult = userStore.authenticate(
credentials.EvernoteUserName,
credentials.EvernotePassword,
CONSUMER_KEY,
CONSUMER_SECRET,
false);
authToken = authenticationResult.AuthenticationToken;

But it fails to authenticate in the sandbox environment. Am I doing something wrong?

ErrorCode: Evernote.EDAM.Error.EDAMErrorCode.INVALID_AUTH
Parameter: consumerKey

[aloneguid]

For me it fails with an error "no request has been sent". I think this SDK is abandoned, no one seems to care (

[vicobiscotti]

Wow. After more than 5 years it seems that nothing has changed. No authentication on Sandbox using the .Net lib, and nobody giving support, nowhere.