Code Works on Arduino, but not Photon?

Troubleshooting
2 
else if(digitalRead(buttonPin) == 0){            //Door Closed
    digitalWrite(ledPin, LOW);
    x = 1;
    Serial.println(digitalRead(buttonPin));            //Prints 0
    delay(100);    
  }

because you are not looking for the state change in the above else if statement.

but you are here:

if ((digitalRead(buttonPin) == 1) && (x == 1))

recommend that you use a non-blocking version like this (untested):

const int ledPin = D7;
const int buttonPin = D0;
const int debounceTime = 50;

void setup() 
{
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(ledPin, OUTPUT);
}

void loop() 
{
  int pressed = checkButton(buttonPin);
  switch(pressed)
  {
    case 1:
      Serial.println("Door Closed");
      digitalWrite(ledPin, LOW);
      // send message here
      break;
    case 2:
      Serial.println("Door Open");
      digitalWrite(ledPin, HIGH);
      // send message here
      break;
    default:
      // nothing to do here
      break;
  }
}

int checkButton(int pin)
{
  static unsigned long lastTime = 0; 
  static bool lastState = false;
  bool state = digitalRead(pin);
  if(state != lastState && millis() - lastTime > debounceTime)
  {
    return state? 2 : 1;
    lastTime = millis();
  }
  return 0;
}
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