Twitter Embed not working on our server

This may be a plugin or theme conflict. Please attempt to disable all plugins, and use one of the default (Twenty*) themes. If the problem goes away, enable them one by one to identify the source of your troubles.

Nops, I did that already, even a fresh installed WordPress Website will give the same error. I have seen on another forum many more people having the same issue.

https://twittercommunity.com/t/wordpress-fails-to-embed-tweets/194433/18

My server is located also at Hetzner (Finland).

It’s working for me on a clean WP install on my computer. What’s the tweet you’re trying to embed?

Any Tweet will not work.

Did you check my video ? https://www.youtube.com/watch?v=M-5gqWiApbk

Yes, I checked your video.

Solution: Using Custom HTML for Twitter Embeds in WordPress

Instead of using the default Twitter embed block in WordPress, you can use custom HTML with the blockquote version of the tweet. This option won’t affect older posts.

1. Find the Tweet you want to embed and click on the ... icon (More).
2. Choose “Embed Tweet” and copy the HTML code provided by Twitter.
3. In your WordPress editor, instead of choosing the Twitter block, choose the Custom HTML block.
4. Paste the copied Twitter HTML into the block.