It's not a regular LED driven by digital HIGH/LOW or PWM. So also make sure you're running something that's talking to the LED correctly. Like NeoPixel library, etc.
Also, possibly some variance with hardware revisions? (from same espressif page linked above)
Here is the setting that works for this board (for me):
ESP32-S3DEVKITC-1-N32R8V (32MB):
USB CDC On Boot: Enabled
CPU Frequency: 240MHz (WiFi)
Core Debug Level: None
USB DFU On Boot: Disabled
Erase All Flash Before Sketch Upload: Disabled
Events Run On: Core 1
Flash Mode: DIO 80MHz
Flash Size: 4MB (32Mb)
JTAG Adapter: Integrated USB JTAG
Arduino Runs On: Core 1
USB Firmware MSC On Boot: Disabled
Partition Scheme: Default 4MB with spiffs (1.2MB APP/1.5MB SPIFFS)
PSRAM: OPI PSRAM
Upload Mode: UART0/Hardware CDC
Upload Speed: 921600
USB Mode: Hardware CDC/JTAG
However I am uploading a serial sketch[as below] and I am only getting the above output in the serial monitor. has my sketch uploaded ? Why am I not getting hello world ? My board is connected on the usb-uart & when I press reset button I get only the above. Thanks
It seems your board is working. Are you connected to the USB or the UART?
It works with the USB port for me (your code).
It doesn't work with the UART port for me. I think you have to install a driver. I do not know how.
Hope this helps. Sorry for responding so late.