SD access with DFR0664 on GDI and Firebeetle: Initialisation error

// FireBeetle 2 ESP32-E

#include "SD.h"
#include "SPI.h"
#include "DFRobot_UI.h"
#include "DFRobot_GDL.h"

#define TFT_DC  D2  // data command
#define TFT_CS  D6  // screen chip select
#define TFT_RST D3  // Reset
#define TFT_BL  D13  // Back light
#define TFT_SD  D5   // SD-Card select

File file;

DFRobot_ST7789_240x320_HW_SPI screen(TFT_DC,TFT_CS,TFT_RST);
DFRobot_UI ui(&screen, NULL);

void setup() {
  Serial.begin(115200);
  ui.begin();
  ui.setTheme(DFRobot_UI::MODERN);
  ui.bgColor = COLOR_RGB565_BLACK;
  screen.fillScreen(COLOR_RGB565_BLACK);
  ui.refresh();

  while(1) {
    if (SD.begin(TFT_SD)){
      Serial.println("SD initialization done.");
      break;
    } else {
      Serial.println("SD initialization failed!");
      ui.drawString(10, 60, "SD Error", COLOR_RGB565_RED,ui.bgColor, 3,0);
    }
  }
  File file = SD.open("/protokoll.txt", FILE_WRITE);
  if (file) {
    file.println("Hello from DFR0664!");
    file.close();
    Serial.println("File written.");
    ui.drawString(10, 90, "Write OK", COLOR_RGB565_WHITE,ui.bgColor, 2,0);
  } else {
    Serial.println("Error on opening the file.");
    ui.drawString(10, 90, "Write FAIL", COLOR_RGB565_RED,ui.bgColor, 2,0);
  }
}

void loop() {

}