Wordpress og:image not working in whatsapp? - wordpress

Question

I had created a Wordpress news website. There are many sharing options implemented! I added WhatsApp and send the URL to WhatsApp and share to WhatsApp! The issue is, initially the post image is shown when I share the link in WhatsApp. But now the image is not showing while I share the link in WhatsApp! There are no issues while sharing on facebook! When I inspect the page source WordPress automatically gives og:image as the post feature image! But it does not show up in WhatsApp. But when I copy paste the same og:image to header.php I WordPress it works perfectly! Initially, I thought of the size problem while later I found out that size is as per the og:image meta tag standard.
Here i post the single.php code:
<?php
/**
* NewsGamer Theme
*
* Theme by: MipThemes
* http://themes.mipdesign.com
*
* Our portfolio: http://themeforest.net/user/mip/portfolio
* Thanks for using our theme!
*
*/
// load header
get_header();
// Get Page properties
$mip_current_page = new MipThemeFramework_Page();
// Update Post View
MipThemeFramework_Post_Views::update_post_views($post->ID);
// Load Custom post headers
get_template_part( 'elements/parts/post-header-'. $mip_current_page->page_template .'' );
?>
<!-- start:post-info-bar -->
<?php if ($mip_current_page->enable_post_info_bar) get_template_part( 'elements/post-info-bar' ); ?>
<!-- end:post-info-bar -->
<!-- start:page content -->
<div id="page-content" class="<?php echo esc_attr($mip_current_page->page_template_class); ?> clearfix">
<?php
//get sidebar
if ( ($mip_current_page->page_sidebar_template == 'left-sidebar')&&(!wp_is_mobile()) ) get_sidebar();
?>
<!-- start:main -->
<div id="main" class="main article">
<!-- start:article post -->
<article id="post-<?php echo esc_attr($post->ID); ?>" <?php post_class('article-post clearfix'); ?> <?php echo MipThemeFramework_Util::get_item_scope( $mip_current_page->review_post ); ?>>
<?php
if (have_posts()) :
// Get Template
get_template_part( 'elements/'. $mip_current_page->page_template .'' );
else :
// No Posts
esc_html_e('No posts.', 'newsgamer');
endif;
?>
</article>
<!-- end:article post -->
</div>
<!-- end:main -->
<?php
//get sidebar
if ( ($mip_current_page->page_sidebar_template == 'right-sidebar')||( ($mip_current_page->page_sidebar_template == 'left-sidebar')&&(wp_is_mobile()) ) ) get_sidebar();
?>
</div>
<!-- end:page content -->
<?php
// load footer
get_footer();
?>

Answer 1

I have had the same problem, everything worked fine in any opengraph testing tool and in the social sites themself's: facebook, twitter, ok, vk but in whatsapp & telegram not.
So after a lot of research, the problem was in our virtual site firewall that protects from site crawling by many logics, a couple of them is IP and User-Agent. The whatsapp & telegram are pinging sites to fetch og data are not throw their servers like social sites, but through your mobile operator's dynamic IP, but the user-agent is of the messenger itself, and it was in our automatically generated blacklist.
Check if you don't ban access to your site by theirs user-agents string that contains: WhatsApp/2.17.395 A or TelegramBot (like TwitterBot)
Wish it helped.