Shamim's Plugins

I have also activated WP Crontrol and in WP-Cron Events this plugin event callback is showing (see screenshot). So maybe some other plugin/code is removing this.
Please change “Sending Interval” to 2 minutes and save changes. Then see if that register cron event again. You can do this couple of times (every time change by 1 or 2 minutes)

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I have tested again now and working correctly.
Please check following
1. Your website can run cron. There are many plugins out there to check.
2. Go to Dashboard > Front End PM PRO > Emails and check all the fields are filled. Eg. Announcement subject, Announcement content.
3. refresh your website couple of times after time ends. Eg. you set 1 minute. Then after 1 minute refresh your website
4. Reduce “Emails send per interval” to 10
5. If you use any customized email template, make sure no errors are there. Also check your server log if any error there.
6. You can also check https://codex.wordpress.org/Editing_wp-config.php#Alternative_Cron

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If you follow that tutorial step by step, any missing string will be there.

In your case, click update button (right button of top 4 buttons) should do the trick.

I have updated above code. Please use this code.

add following code in your theme’s (child theme’s if any) functions.php

add_filter( 'fep_query_url_without_esc_filter', function( $url, $args ){
    $url = add_query_arg( $args, 'http://example.com/my-page/messages' ); //your page url
    return $url;
}, 10, 2 );

Please do not commented that out.
PRO version announcement emails use queue system. read more in https://www.shamimsplugins.com/docs/front-end-pm-pro/getting-started-2/announcement-email-queue/
See your setup and wait at least that much time. You can reduce time in setup to trigger quickly. As wordpress cron require visitor to work, make sure you have visitor.

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I am sorry, had a typo in code. I have corrected it is last reply. please use that code.

To add a menu button with unique class add following code in your theme’s (child theme’s if any) functions.php

add_filter( 'fep_menu_buttons', function( $menu ) {
    $menu['cus_button'] = array(
        'title'		=> __( 'Edit', 'front-end-pm' ),
	'action'	=> 'edit',
        'class'         => 'fep-button your_unique_class',
	'priority'	=> 15,
    );
    return $menu;
});

No need to create legend for that.

Proceed in following way.

1. register your email template

add_filter( 'fep_eb_templates', function( $templates, $where ) {
  $templates['new_message'] = 'Nieuw bericht';
  return $templates;
}, 10, 2 );

2. Now in emails/new_message.php file use

$language = get_user_meta( fep_get_userdata( $user_email, 'ID', 'email'), 'icl_admin_language', true );

if( 'fr' == $language ){
    require( fep_locate_template( 'emails/new_message_fr.php' ) );
}

Let me know.