authentication - Identity Server 3 Access Token Validation endpoint fails with Audience Validation Failed -

i have identityserver3 instance set , requesting token using authorize endpoint (/core/connect/authorize).

my application requesting token ios application.

i pass following parameters;

client_id=<clientid> response_type=id_token scope=openid redirect_uri=<redirecturi> state=<state> nonce=<nonce> 

this opens web view me, enter credentials , returns redirect_uri #id_token appended url.

to validate token pass access token validation endpoint (/core/connect/accesstokenvalidation) of identityserver. append ?token=<access token received login>.

i response

{ "message": "invalid_token" } 

when check log

system.identitymodel.tokens.securitytokeninvalidaudienceexception: idx10214: audience validation failed. audience: '<clientid>'. did not match: validationparamters.validaudience: '<identity_server_host>/resources' or validationparameters.validaudiences: 'null' 

what doing wrong here? surely identityserver created token should validate valid?

you don't request access token in example. with

response_type=id_token 

you identity token can validate against identity token endpoint. access token request must change request to

response_type=id_token token