Android Webview blank

Trying to build an in-app viewer for external documents (url supplied by an API)

<Alloy>
    <Window id='docView'>
        <View class='header'>
            <Label class='headerLabel' id='title'>MY DOCUMENTS</Label>
        </View>
        <WebView id='docViewTable' class='table'></WebView> 
    </Window>
</Alloy>

var args = arguments[0] || {};
 
Alloy.Globals.tracker.trackScreen('Document View');
 
$.title.text = args.name;
 
args.url = encodeURI('https://vcsdatabase.com/influenza_declination_view.php?vendor_id=116943&credential_id=39&declination_id=113702&viewSource=mobileApp&token=v0ur3epsi8ipfg6md8kq2c4uv2');
 
$.docViewTable.url = args.url;
$.docViewTable.hideLoadIndicator = true;
 
function close() {
    $.docView.close();
}

Even with encodeURI it doesn't load. Just a blank view. I've tried it with normal URLs and it works fine.

I'm guessing it something to do with the nature of the url/document, which I unfortunately can't control. Any ideas for fixes/workarounds?

Thanks!