you're not doing anything wrong, that's just how it is. it's neither a bug nor really a feature -- but making the crossposter available to clients would be a lot of work for very little reward, since most clients can crosspost already themselves (ie. you can easily set up flickr to crosspost to your LJ and IJ and blogger accounts).
so at this point and for the foreseeable future, the crossposter will be a web-client only.
Cross-posting Question
you're not doing anything wrong, that's just how it is. it's neither a bug nor really a feature -- but making the crossposter available to clients would be a lot of work for very little reward, since most clients can crosspost already themselves (ie. you can easily set up flickr to crosspost to your LJ and IJ and blogger accounts).
so at this point and for the foreseeable future, the crossposter will be a web-client only.