Adafruit sph0645 with xiao rp2040 input

Hello everyone, I have recently bought i2s mic from adafruit and am trying to simply read the mic and output the readings to serial monitor. I am using I2SInput example from arduino example library. Here is my code:

#include <I2S.h>

I2S i2s(INPUT);

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

  i2s.setDATA(4);
  i2s.setBCLK(5); // Note: LRCLK = BCLK + 1
  i2s.setBitsPerSample(16);
  i2s.setFrequency(22050);
  // NOTE: The following values are known to work with the Adafruit microphone:
  // i2s.setBitsPerSample(32);
  // i2s.setFrequency(16000);
  i2s.begin();

  while (1) {
    int16_t l, r;
    i2s.read16(&l, &r);
    // NOTE: Adafruit microphone word size needs to match the BPS above.
    // int32_t l, r;
    // i2s.read32(&l, &r);
    Serial.printf("%d %d\r\n", l, r);
  }
}

void loop() {
  /* Nothing here */
}

I have wired mic and board as following:
GND->GND
3V3->3V
D4->DOUT
D5->BCLK
D6->LRCL

From serial monitor I am getting always zeros despite all the noise I am trying to produce. It looks like something does not work properly.
Can anyone tell me what I am doing wrong here? Thanks

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