I am following The implicit OAuth 2.0 flow Guide:

My client ID is 4709 while key is RoZwtHUrhMP088oVGCMlxA((

I appended my URL as:

https://stackexchange.com/oauth/dialog?client_id=4709&scope=private_info&redirect_uri=https://stackexchange.com/oauth/login_success

and trying to oauth.

And I got this URL as returned:
https://stackexchange.com/oauth/login_success#access_token=I*SJDoi6W(TUAz2BRCEzbw))&expires=86399

I notice that I*SJDoi6W(TUAz2BRCEzbw)) is the access_token.

When I try to call the request as this answer of my question .

So I call

http://api.stackexchange.com/2.2/questions/30028657/answers?site=stackoverflow&key=RoZwtHUrhMP088oVGCMlxA((&access_token=I*SJDoi6W(TUAz2BRCEzbw))&filter=!%294k-FmUi-xgG3sdSdPz*cQNNqR0A

Unfortunately, I got 403 Error:

{"error_id":403,"error_message":"key is not valid for passed access_token, token not found.","error_name":"access_denied"}

Any Idea?