NSExtensionContext openURL not working from OS X Today extension

Question

I want to call my app on my OSX Today Extension. This is the code that I'm using for testing:

NSURL *appURL = [NSURL URLWithString:@"http://www.google.com"];    
NSAssert(self.extensionContext != nil, @"extension context is nil");
[self.extensionContext openURL:appURL completionHandler:^(BOOL success) {
    NSLog(@"opened successfully: %@", success ? @"YES" : @"NO");

}];

Its being called when the user triggers thte double action of a NSTableView. I was not sure If I was using the URL for my app correctly, so I set it to google for testing. The thing is that the completion handler is not being called, so I'm guessing somehting is blocking it.

Do I need to specify something in the sandbox capabilities for this to work, or anything else I should check ?