wordpress - admin-post.php not calling custom handler hook

I've got a basic email form that I want to use a custom handler on. I tried following this tutorial https://blog.osmosys.asia/2016/05/07/handling-form-submissions-in-wordpress/ but it seems that my custom hook is not being called.

<form class="" action="<?php echo admin_url('admin-post.php') ?>" method="post">
        <input type="hidden" name="action" value="bb_submit_email">
        <input type="email" id="email" name="email" value="[email protected]" required>
        <?php wp_nonce_field('submit-email', '_mynonce'); ?>
        <input type="submit" class="float-right btn btn-primary form-button" value="Submit">
</form>

<?php
add_action('admin_post_bb_submit_email', 'bb_handle_email_submit');
add_action('admin_post_nopriv_bb_submit_email', 'bb_handle_email_submit');

function bb_handle_email_submit() {

$logger = wc_get_logger();
$logger->add('submit-email-debug', 'triggered!'); 

    

if ( !isset($_POST['_mynonce']) || !wp_verify_nonce($_POST['_mynonce'], 'register-user')) {
    return;
}

wp_remote_post('example.com', $_POST );
}
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I tried usingwp_ajax instead but that didn't work either. Anyone see something I'm missing here?

Update: I don't know if this helps but I checked the POST Request data and it has the following:

action: bb_submit_email
email: [email protected]
_mynonce: a2c0e80de7
_wp_http_referer: /
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That all looks right to me?

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