Thank you for your answer, I’ll explain better:
I have a hosting service where apparently mod_env is not available due to security concerns, and the only thing similar is the setenvif_module.
I’ve triple checked everything you suggested and everything is on point, I’ve also previously tried Omeka S on a debian virtual machine without any issues of this kind whatsoever.
I found another question on the forum which is similar to mine, this one, and I’ve left the .htaccess file as it was then added the line on bootstrap.php. Still nothing, I get the same error in the error log:
Invalid command ‘SetEnv’, perhaps misspelled or defined by a module not included in the server configuration
Whenever I try to connect to domain/omeka-s/admin it gives off this error:
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator at webmaster@domain.it to inform them of the time this error occurred, and the actions you performed just before this error.
More information about this error may be available in the server error log.
Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.
I think it is strictly a module issue, but I can’t still find any solution around it. Is there any possible way to do so without directly using the SetEnv in .htaccess?