Apple Watch Data Share

i'm facing a issue when trying to share data between Apple Watch and iPhone (both on simulator).

That's how i'm storing the data on my iPhone App:

    NSUserDefaults* defaults = [[NSUserDefaults alloc]initWithSuiteName:@"group.com.myapp"];
[defaults setObject:@"TEST" forKey:@"testKey"];
[defaults synchronize];

And that's how i'm trying to retrieve the data on my watch App:

NSUserDefaults* defaults = [[NSUserDefaults alloc]initWithSuiteName:@"group.com.myapp"];
    NSLog(@"%@",[defaults objectForKey:@"testKey"]);

It just returns NULL

I've configured the "appGroups" already, and my entitlements file looks like this:

I've tried everything i could, but i couldn't get this to work... Can somebody help me with that?

Thank you very much!