Error displaying oEmbed Wordpress

Question

I've a problem with my wordpress website. When I insert some url for being embedded, it's not working fine.

Here is the issue URL : https://www.duosia.id/windows/cara-mengekstrak-files-menggunakan-winrar-dengan-mudah

And here is the Screenshot :

When I try to visit the embedded url. It's return 404 not found. You can check the embedded url here, https://www.duosia.id/windows/cara-mengekstrak-files-menggunakan-winrar-dengan-mudah/embed/

I've try these common solutions.

1. Update everything including WordPress, the theme and plugins. Available updates appear in Dashboard > Updates.
2. Deactivate all plugins in case there is a conflict. If the problem goes away while all plugins are inactive, then reactivate them one by one to determine which is causing the problem.
3. Switch to the default theme (such as Twenty Thirteen) then try to do what was not working. If the problem remains, it is a general WordPress or hosting issue. If it happens only while using our theme, please let us know.
4. Clear cache in both your browser and in any caching plugins that you are using (also disable services like CloudFlare, if used with your website).
5. Revert code changes if you have modified the theme’s code. If using a child theme, reactivate the parent theme.

But, seems no one work.

Answer 1

The WordPress post embeds don't seem to be working on your site. This URL shows a live example of the problem:

https://www.duosia.id/windows/whatsapp-for-pc/

The two embeds present in that URL are returning a 404, therefore, oEmbeds are not loading properly and showing the 404 page:

https://www.duosia.id/windows/facebook-messenger-for-pc/embed/#?secret=kMPv636bx1 https://www.duosia.id/windows/line-for-pc/embed/#?secret=65m4VpxiYi

Have you tried testing those URLs in the plugin "Rewrite Rules Inspector"? You should see something like this for any of the "embed" URLs:

index.php?name=$matches[1]&embed=true

Also, have you tried flushing the rewrite rules in WordPress or maybe setting the permalink structure to a different/default one (right now you seem to be using a structure of "category/post-name") to see if it changes anything?