Can't blink LED with HAL

Hey all,

I have a 32F469IDISCOVERY BOARD that I'm trying to use with CubeIDE, and all I'm trying to do right now is blink an LED with the HAL.

Starting from a new project, all periherals are initialized with their default settings.

In the User Code 3 loop, all I'm going is adding this code:

HAL_GPIO_TogglePin(GPIOD, GPIO_PIN_4);
HAL_Delay(1000);

Which should, apparently, blink an LED. Unfortunately, nothing is happening. If I set the default mode to High or Low in the Cube configuration, I can get it to stay on or stay off--but can't manipluate it all all with code.

Again, this is with a 100% fresh project and all the manufacture peripheral settings.

Any help is appreciated. I must be missing something simple. Thanks!