How to get a token with "groups" rights?

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I can't get a response from the "groups.getBanned" method with a token from my application.

{"error":{"error_code":15,"error_msg":"Access denied: no access to call this method","request_params":[{"key":"oauth","value":"1"} ,{"key":"method","value":"groups.getBanned"},{"key":"group_id","value":"XXX"}]}}

When receiving a token from the iPhone (app3087106), the answer comes.
Specified the following rights:

scope=wall,photos,offline,groups,friends,status