I inserted an SD card to the built in card slot of the T-7670G but when I run the SDCard example from the official github library (https://github.com/Xinyuan-LilyGO/LilyGO-T-A76XX/), I get an "Card Mount Failed" error.

I have tried two different SD cards, neither one works:

San Disk 32GB SDHC with the following format:

San Disk 64GB SDXC with the following format:

I am running with the official SD card example with no change to the code, so I assume the SPI pinout is correct.

/**
 * @file      SDCard.ino
 * @author    Lewis He (lewishe@outlook.com)
 * @license   MIT
 * @copyright Copyright (c) 2023  Shenzhen Xin Yuan Electronic Technology Co., Ltd
 * @date      2023-10-30
 *
 */
#include <FS.h>
#include <SD.h>
#include <SPI.h>
#include "utilities.h"

#if defined(LILYGO_T_CALL_A7670_V1_0) || defined(LILYGO_T_A7608X_DC_S3)
#error "This board not SD slot"
#endif


void listDir(fs::FS &fs, const char *dirname, uint8_t levels)
{
    Serial.printf("Listing directory: %s\n", dirname);

    File root = fs.open(dirname);
    if (!root) {
        Serial.println("Failed to open directory");
        return;
    }
    if (!root.isDirectory()) {
        Serial.println("Not a directory");
        return;
    }

    File file = root.openNextFile();
    while (file) {
        if (file.isDirectory()) {
            Serial.print("  DIR : ");
            Serial.println(file.name());
            if (levels) {
                listDir(fs, file.path(), levels - 1);
            }
        } else {
            Serial.print("  FILE: ");
            Serial.print(file.name());
            Serial.print("  SIZE: ");
            Serial.println(file.size());
        }
        file = root.openNextFile();
    }
}

void createDir(fs::FS &fs, const char *path)
{
    Serial.printf("Creating Dir: %s\n", path);
    if (fs.mkdir(path)) {
        Serial.println("Dir created");
    } else {
        Serial.println("mkdir failed");
    }
}

void removeDir(fs::FS &fs, const char *path)
{
    Serial.printf("Removing Dir: %s\n", path);
    if (fs.rmdir(path)) {
        Serial.println("Dir removed");
    } else {
        Serial.println("rmdir failed");
    }
}

void readFile(fs::FS &fs, const char *path)
{
    Serial.printf("Reading file: %s\n", path);

    File file = fs.open(path);
    if (!file) {
        Serial.println("Failed to open file for reading");
        return;
    }

    Serial.print("Read from file: ");
    while (file.available()) {
        Serial.write(file.read());
    }
    file.close();
}

void writeFile(fs::FS &fs, const char *path, const char *message)
{
    Serial.printf("Writing file: %s\n", path);

    File file = fs.open(path, FILE_WRITE);
    if (!file) {
        Serial.println("Failed to open file for writing");
        return;
    }
    if (file.print(message)) {
        Serial.println("File written");
    } else {
        Serial.println("Write failed");
    }
    file.close();
}

void appendFile(fs::FS &fs, const char *path, const char *message)
{
    Serial.printf("Appending to file: %s\n", path);

    File file = fs.open(path, FILE_APPEND);
    if (!file) {
        Serial.println("Failed to open file for appending");
        return;
    }
    if (file.print(message)) {
        Serial.println("Message appended");
    } else {
        Serial.println("Append failed");
    }
    file.close();
}

void renameFile(fs::FS &fs, const char *path1, const char *path2)
{
    Serial.printf("Renaming file %s to %s\n", path1, path2);
    if (fs.rename(path1, path2)) {
        Serial.println("File renamed");
    } else {
        Serial.println("Rename failed");
    }
}

void deleteFile(fs::FS &fs, const char *path)
{
    Serial.printf("Deleting file: %s\n", path);
    if (fs.remove(path)) {
        Serial.println("File deleted");
    } else {
        Serial.println("Delete failed");
    }
}

void testFileIO(fs::FS &fs, const char *path)
{
    File file = fs.open(path);
    static uint8_t buf[512];
    size_t len = 0;
    uint32_t start = millis();
    uint32_t end = start;
    if (file) {
        len = file.size();
        size_t flen = len;
        start = millis();
        while (len) {
            size_t toRead = len;
            if (toRead > 512) {
                toRead = 512;
            }
            file.read(buf, toRead);
            len -= toRead;
        }
        end = millis() - start;
        Serial.printf("%u bytes read for %u ms\n", flen, end);
        file.close();
    } else {
        Serial.println("Failed to open file for reading");
    }


    file = fs.open(path, FILE_WRITE);
    if (!file) {
        Serial.println("Failed to open file for writing");
        return;
    }

    size_t i;
    start = millis();
    for (i = 0; i < 2048; i++) {
        file.write(buf, 512);
    }
    end = millis() - start;
    Serial.printf("%u bytes written for %u ms\n", 2048 * 512, end);
    file.close();
}

void setup()
{
    Serial.begin(115200);

    SPI.begin(BOARD_SCK_PIN, BOARD_MISO_PIN, BOARD_MOSI_PIN);
    if (!SD.begin(BOARD_SD_CS_PIN)) {
        Serial.println("Card Mount Failed");
        return;
    }
    uint8_t cardType = SD.cardType();

    if (cardType == CARD_NONE) {
        Serial.println("No SD card attached");
        return;
    }

    Serial.print("SD Card Type: ");
    if (cardType == CARD_MMC) {
        Serial.println("MMC");
    } else if (cardType == CARD_SD) {
        Serial.println("SDSC");
    } else if (cardType == CARD_SDHC) {
        Serial.println("SDHC");
    } else {
        Serial.println("UNKNOWN");
    }

    uint64_t cardSize = SD.cardSize() / (1024 * 1024);
    Serial.printf("SD Card Size: %lluMB\n", cardSize);

    listDir(SD, "/", 0);
    createDir(SD, "/mydir");
    listDir(SD, "/", 0);
    removeDir(SD, "/mydir");
    listDir(SD, "/", 2);
    writeFile(SD, "/hello.txt", "Hello ");
    appendFile(SD, "/hello.txt", "World!\n");
    readFile(SD, "/hello.txt");
    deleteFile(SD, "/foo.txt");
    renameFile(SD, "/hello.txt", "/foo.txt");
    readFile(SD, "/foo.txt");
    testFileIO(SD, "/test.txt");
    Serial.printf("Total space: %lluMB\n", SD.totalBytes() / (1024 * 1024));
    Serial.printf("Used space: %lluMB\n", SD.usedBytes() / (1024 * 1024));
}

void loop()
{

}

Any ideas?