Ok, I have tried in another subdomain that I have without Polylang and does not work too. Is not this plugin. And I does not have any other plugin installed.
My subdomain URL is https://subdomain.domain.com/ there is a problem with this structure?
I do not know what is happening…
The message is “No files have been processed”.
I only have 1 plugin installed that is Polylang. Could be the home URL of the site? It is sample.com/es/ or sample.com/en/ not sample.com/.
The theme is a theme that I developed, and with this theme I have other domines that this plugin works perfectly but in any of them I have Polylang installed. It could be the problem…