Write URL into ntag215 with password protection

Question

i am trying to write a URL into an ntag215 that has password protection but i am not being able to do so. This password protection has been set by me. This means i know PWD and PACK for the tag, and i have correctly overwriten them in the tag (together with AUTH0, AUTH_LIM and PROT). The thing is that the authentication of the tag is correct, this means that when i try to verify the PACK i receive with the PACK i have, both are the same. Here is an example of how i do this. The functions i use here are ok.

URLActivateButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (myTag == null) {
                    Toast.makeText(context, "my tag not detected", Toast.LENGTH_SHORT).show();
                    Toast.makeText(context, Error_detected, Toast.LENGTH_LONG).show();
                } else {
                    Ndef ndef_writable = Ndef.get(myTag);
                    NfcA nfcA = NfcA.get(myTag);

                    try {
                        nfcA.connect(); // Intenta conectar con la tag NFC


                        if (ndef_writable.isWritable()) {
                            // Obtener la contraseña en formato de bytes
                            byte[] passwordBytes = getPasswordBytes();

                            try {
                                // Enviar el comando PWD_AUTH al tag NFC
                                byte[] response = nfcA.transceive(new byte[] {
                                        (byte) 0x1B, // PWD_AUTH
                                        passwordBytes[0], passwordBytes[1], passwordBytes[2], passwordBytes[3]
                                });

                                if ((response != null) && (response.length >= 2)) {
                                    // Obtener PACK para verificar la autenticidad del tag
                                    byte[] pack = Arrays.copyOf(response, 2);

                                    // Verificar PACK para confirmar que el tag es auténtico
                                    if (verifyPack(pack)) {
                                        nfcA.close();
                                        // Autenticación exitosa, ahora puedes realizar la escritura en la tag

                                        writeURLtoTag(myTag, createUriMessage(edit_url.getText().toString()));
                                        Toast.makeText(context, Write_Succes, Toast.LENGTH_LONG).show();

//... rest of the code

However the issue comes in the function writeURLtoTag. This is the function:

public void writeURLtoTag(Tag tag, NdefMessage message)  {
        if (tag != null) {
            try {
                Ndef ndefTag = Ndef.get(tag);

                if (ndefTag == null) {
                    // Let's try to format the Tag in NDEF
                    NdefFormatable nForm = NdefFormatable.get(tag);
                    if (nForm != null) {
                        // Formatear la etiqueta si es necesario
                        nForm.connect();
                        nForm.format(message);
                        nForm.close();
                    } else {
                        // Manejar el caso en que la etiqueta no sea compatible con NDEF ni NdefFormatable
                        Log.e("TagAuth", "Tag not compatible with NDEF");
                        Toast.makeText(context, "Tag not compatible with NDEF", Toast.LENGTH_SHORT).show();
                    }
                } else {
                    // Verificar el contenido actual de la etiqueta antes de escribir
                    NdefMessage currentMessage = ndefTag.getCachedNdefMessage();
                    if (currentMessage != null) {
                        // Puedes imprimir o manejar el contenido actual de la etiqueta si es necesario
                        Log.d("TagAuth", "Current NDEF Message: " + currentMessage.toString());
                    }

                    // Continuar con la conexión y escritura en la etiqueta
                    ndefTag.connect();
                    try {
                        checkTagStatus(tag);
                        ndefTag.writeNdefMessage(message);
                        Toast.makeText(context, "Write Successful", Toast.LENGTH_SHORT).show();
                    } catch (IOException e) {
                        Log.e("TagAuth", "IOException during writeNdefMessage: " + e.getMessage());
                        Toast.makeText(context, "IOException during writeNdefMessage", Toast.LENGTH_SHORT).show();
                        e.printStackTrace();
                    }
                    ndefTag.close();
                }
            }
            catch(Exception e) {
                Log.e("TagAuth", "Error during write Ndef: " + e.toString());
                Toast.makeText(context, "Writing Error", Toast.LENGTH_SHORT).show();
                e.printStackTrace();
            }
        }
    }

Everytime i try to do ndefTag.writeNdefMessage(message) i get an IO exception "IOException during writeNdefMessage: null". I don't understand this. Why, if i have been authenticated, i can't write a new URL to the tag? Can someone help me to solve this problem?

Thank you very much