How to validate a token issued by IdentityServer3 using WebApi - rest

Question

I need help to understand what is happening in the following scenario.
I have an architecture drawn as below.
0 - Presentation
1 - Authentication Server (Using IdentityServer3)
2 - Isolated WebApi using OData (Without Default Controllers by AspNet.Identity)
3 - Business Services
4 - Custom Repository
5 - Repository generic and data access layer
The layers of number 0 and 2 necessarily perform their authentication through layer number 1.
Authentication is working perfectly for my number 1 presentation layer using implicit flow.
However, the WebApi number 2 small services layer is failing to authenticate by passing the token provided by the authentication server.
I received the following message.
{
"odata.error": {
"code": "",
"message": {
"lang": "en-US",
"value": "Authorization has been denied for this request."
}
}
}
My ConfigAuth in WebApi
public static void ConfigureAuth(IAppBuilder app)
{
JwtSecurityTokenHandler.InboundClaimTypeMap.Clear();
app.UseIdentityServerBearerTokenAuthentication(new IdentityServerBearerTokenAuthenticationOptions
{
ClientId = "WebApi",
ClientSecret = "secret",
Authority = "http://localhost:35373/identity", // TODO: Vai mudar com a versão final
RequiredScopes = new[] { "read" , "write" , "offline_access" }
});
app.UseWebApi(WebApiConfig.Register());
app.UseCors(Microsoft.Owin.Cors.CorsOptions.AllowAll);
app.UseOAuthBearerAuthentication(new OAuthBearerAuthenticationOptions());
}
This is my request token from identityserver3
{
"access_token": "5f4ca4bc0514158409903080af5c1081",
"expires_in": 3600,
"token_type": "Bearer",
"refresh_token": "a8cd624dd3169a607bdb24ad0833d1b3"
}