How get a data from cborMap?

Question

I decode byte array with cbor and I want get a data but if I use cborMap.get("String"), not found a value.

    byte[] bytecompressed = Base45.getDecoder().decode(withoutPrefix);

    Inflater inflater = new Inflater();
    inflater.setInput(bytecompressed);
    int BUFFER_SIZE = bytecompressed.length;

    ByteArrayOutputStream outputStream = new ByteArrayOutputStream(BUFFER_SIZE);

    byte[] buffer = new byte[BUFFER_SIZE];
    while (!inflater.finished()) {
        final int count;
        try {
            count = inflater.inflate(buffer);
            outputStream.write(buffer, 0, count);
        } catch (DataFormatException e) {
            e.printStackTrace();
        }

    }

    Message a = null;
    try {
        a = Encrypt0Message.DecodeFromBytes(outputStream.toByteArray());
        CborMap cborMap = CborMap.createFromCborByteArray(a.GetContent());

        System.out.println("CBORMAP " + cborMap);
       
    

        cborMap.get("dn"); //NOT FOUND