I'm using Trello's Developer API's implementation of OAuth to post stuff to a list.

I've successfully made a request and got my `oauth_token` and `oauth_token_secret` back from <https://trello.com/1/OAuthGetRequestToken>

But when I call <https://trello.com/1/OAuthAuthorizeToken>, passing the `oauth_token` that I've just received, I get a response of 'App not found'.

Can anyone help?

---

**EDIT:** Here's what I'm getting back from <https://trello.com/1/OAuthGetRequestToken>

```
oauth_token=8d0e43fd0cc67726567d49ae5e818852&oauth_token_secret=[secret]

```

And here's the Authorization header I'm sending (escaped in C#)

```
"OAuth oauth_version=\"1.0\", oauth_signature_method=\"HMAC-SHA1\", oauth_nonce=\"8335006\", oauth_timestamp=\"1414663625\", oauth_consumer_key=\"9612eaca23c7bdd3eca60dc8c2a8159c\", oauth_signature=\"M6sLyyfHGYXOtQnLJexDx96kbFo=\", oauth_token=\"8d0e43fd0cc67726567d49ae5e818852\""

```

Am I doing something wrong or is this an error on Trello's end?

---

**EDIT:** I'm using RestSharp to call the Trello API, as below:

```
var client = new RestSharp.RestClient("https://trello.com/");
var request = new RestSharp.RestRequest("1/OAuthAuthorizeToken", Method.GET);

```

---

**EDIT:** Here's the complete RestSharp code:

```
var client = new RestSharp.RestClient("https://trello.com/");
var request = new RestSharp.RestRequest("1/OAuthAuthorizeToken", Method.GET);
Uri uri = new Uri(string.Format("{0}/{1}", client.BaseUrl, request.Resource));

string authHeader = GenerateAuthorizationHeader(uri);

//This is the output of GenerateAuthorizationHeader() 
//string authHeader = "OAuth oauth_version=\"1.0\", oauth_signature_method=\"HMAC-SHA1\", oauth_nonce=\"8335006\", oauth_timestamp=\"1414663625\", oauth_consumer_key=\"9612eaca23c7bdd3eca60dc8c2a8159c\", oauth_signature=\"M6sLyyfHGYXOtQnLJexDx96kbFo=\", oauth_token=\"8d0e43fd0cc67726567d49ae5e818852\"";

request.AddHeader("Authorization", authHeader);

```

The GenerateAuthorizationHeader method uses `OAuth.OAuthBase` to generate the TimeStamp and Signature for the OAuth request.