I would like to set an NDEF message on my website if it is opened from android chrome and read it with an NFC Reader using nfcpy.

According to https://developer.mozilla.org/en-US/docs/Web/API/NDEFMessage/NDEFMessage I think I should be able to do this.

My page looks like this:

<button onclick="set_ndef()">Set NDEF msg</button>
<pre id="log"></pre>

<script>
async function set_ndef() {
  if ("NDEFReader" in window) {
    try {
      const ndefmsg = new NDEFMessage({'records': [{'recordType': 'text', 'data': 'asd'}]});
      consoleLog(ndefmsg)
    } catch(error) {
      consoleLog(error);
    }
  } else {
    consoleLog("Web NFC is not supported.");
  }
}

function consoleLog(data) {
    var logElement = document.getElementById('log');
    logElement.innerHTML += data + '\n';
}
</script>

The website uses HTTPS, and when I press the button an NDEFRecord object is printed into the div.

I have an acr122u NFC reader, which I was able to set up using nfcpy:

import nfc
import time    

def on_connect(tag):
    print(tag.identifier.hex())
    tag_ident = tag.identifier.hex()[:8]
    print(tag.ndef)
    if tag.ndef:
        for record in tag.ndef:
            print(record)
    return True


while True:
    with nfc.ContactlessFrontend('usb') as clf:
        tag = clf.connect(rdwr={'on-connect': on_connect, 'beep-on-connect': True})
    time.sleep(1)

After I place my phone on the reader (after pressing the button on the page) I am only able to read the UID of the phone, but the tag.ndef is None

How can I do this (if I am even able to)?