Where am I going wrong with the code for the next code challenge? Seems simple, but for some reason I can't pass it.

I was feeling pretty confident going into this challenge, but for some reason my code is not being accepted by the challenge (task instructions below). When I open the "Preview", it does not show any kind of errors, or even anything else... Just blank. I have tried searching for other solutions to my problem, but all I am coming up with are codes basically the same as mine. Where am I going wrong, or what am I not seeing?

Task Instructions

For this task, let's create a enum named MobilePhone. The enum will have three members: iphone, android and windowsPhone.

Each of these members should have a String value as its associated value.

Once you have an enum declared, assign the value of the iPhone member with an associated value of "7 Plus" to a constant named iphone.

My Code

enum MobilePhone {
  case iPhone(String)
  case android(String)
  case windowsPhone(String)
}

let iphone = MobilePhone.iPhone("7 Plus")