Help with Port Manipulation on Arduino Due

Using Arduino Programming Questions
1

I'm trying to understand port manipulation, and I am able to read ports perfectly fine, but when it comes to registering their mode, I get nothing. I have a wire in 43 and one in GND. When they connect, it should print "LOW"; anytime they are not connected it should print "HIGH". What is wrong with the setup in the second code block?
This code worked fine

#define port PIOA
#define pin PIO_PA20


void setup() {
  Serial.begin(9600);
  pinMode(43, INPUT_PULLUP);
}

void loop() {
  if (port->PIO_PDSR & pin) {
    Serial.println("HIGH");
  } 
  else {
    Serial.println("LOW");
  }
  delay(10);
}

but this code doesn't work and seems to not register the pin

#define port PIOA
#define pin PIO_PA20


void setup() {
  Serial.begin(9600);
  
  port->PIO_PER = pin;
  port->PIO_ODR = pin;
  port->PIO_PUER = pin;
}

void loop() {
  if (port->PIO_PDSR & pin) {
    Serial.println("HIGH");
  } else {
    Serial.println("LOW");
  }
  delay(10);
}
2

Did you enabled the peripheral clock for PIOA?

I'd think that would have already happened, but pinMode() does do it explicitly (using libsam functions, rather than "bare metal")