Failure redirecting from the domain to the domain plus language after migration from cPanel to Plesk

[Luis22]

Hi, I migrated a Prestashop 1.7 installation from a cPanel to a Plesk.

The website has two languages, but the redirection fails when I write the domain without the primary language in the URL. If I type domain.com in the address bar, Prestashop does not redirect to https://dominio.com/es/. Consequently, the web shows a message that the store is under maintenance.

However, the web works fine, although I have yet to make any purchases to check this. But if I type domain.com/en/ directly, it works fine.

Among the things I have done to try to fix the problem:

• I have regenerated the htaccess,
• I have checked the parameters Shop and Shop_URL in the ps_configuration table in the database.
• I have cleared the browser and Prestashop caches,
• Of course, the people on my server have checked everything and found nothing strange.
• I have disabled Firewalls and any protection on the server in the Plesk installation.
• Also, Mod_rewrite has been deactivated, 
• and I don't know what else to do anymore.

Any idea about why this may be happening and how to fix it?

Thanks in advance!