Php nonce field is not rendering in html code snippet

Hi,
I have an html form in which I have a nonce field. Unfortunately, the nonce field is not rendering in the source code. I am using html code snippet.

The code is as follows:

<form method="post" action="<?php echo esc_url( home_url() ); ?>">
    <input name="accept" type="checkbox" value="Gdpr" required /> I accept the GDPR
    <input type="submit" id="accept-button" value="Accept" />
    <?php wp_nonce_field( 'accept-gdpr', 'accept_gdpr_nonce' ); ?>
</form>

The part which is not rendering is :
<?php wp_nonce_field( 'accept-gdpr', 'accept_gdpr_nonce' ); ?>
It is getting commented in source code.
How can I solve this?
Thank you.