Subdomain and site network

Hello, I want to create a multilingual blog in subdomains.

So I did a site network installation and I have set polylang to subdomain.

I did the installation on the main domain titiranol.com but I only use it to manage the pages and articles.

The sub-domains respond well in 200, for example :
https://de.titiranol.com/
https://es.titiranol.com/

The problem is when I create an article and I publish it for a language, it puts me every time the message “SORRY, NO MESSAGE FOUND”.

The articles I created on titiranol.com generate 404 :
https://fr.titiranol.com/bonjour-tout-le-monde2/
https://de.titiranol.com/hallo-alle-zusammen/
https://es.titiranol.com/test-espagnol/

But if I create articles on each back office of my network the urls answer in 200.

https://de.titiranol.com/bonjour-tout-le-monde/

Is the network system the problem?
I have only 1 wordpress installation and my subdomains are in the same directory, my DNS seem to be OK too.

Thank you for your feedback.

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