#include <Wire.h>
#define SDA2 25
#define SCL2 13
TwoWire Wire1 = TwoWire(1);

void setup()
{
  Serial.println("M5 I2C Tester");
  //Wire.begin();
  Wire1.begin(SDA2, SCL2, 400000); 
  Serial.begin(115200);

  delay(3000);
}

void loop()
{
  // scan for i2c devices
  byte error, address;
  int nDevices;

  Serial.println("Scanning...");

  nDevices = 0;
  for (address = 1; address < 127; address++ )
  {
    // The i2c_scanner uses the return value of
    // the Write.endTransmisstion to see if
    // a device did acknowledge to the address.
    Wire.beginTransmission(address);
    error = Wire.endTransmission();

    if (error == 0)
    {
      Serial.print("I2C device found at address 0x");
      if (address < 16)
        Serial.print("0");
      Serial.print(address, HEX);
      Serial.println("  !");

      nDevices++;
    }
    else if (error == 4)
    {
      Serial.print("Unknow error at address 0x");
      if (address < 16)
        Serial.print("0");
      Serial.println(address, HEX);
    }
  }
  if (nDevices == 0)
    Serial.println("No I2C devices found\n");
  else
    Serial.println("done\n");
}

and the output:

Arduino: 1.8.9 (Mac OS X), Board: "M5Stack-Core-ESP32, QIO, 80MHz, Default, 921600, None"

libraries/Wire/Wire.cpp.o:(.bss.Wire1+0x0): multiple definition of `Wire1'
sketch/sketch_aug29a.ino.cpp.o:(.bss.Wire1+0x0): first defined here
collect2: error: ld returned 1 exit status
exit status 1
Error compiling for board M5Stack-Core-ESP32.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

Wire.begin();
Wire1.begin(SDA2, SCL2, 400000);

Wire.begin();
  Wire1.begin(SDA2, SCL2, 400000);

Try deleting Wire.begin();