Yes, the problem seems to be the php service is not properly starting (domains seemed to work because of cache):
Dec 03 14:37:35 srvurb01.urbaman.it systemd[1]: Starting The PHP 7.4.0 FastCGI Process Manager...
Dec 03 14:37:35 srvurb01.urbaman.it php-fpm[5615]: [03-Dec-2019 14:37:35] WARNING: Nothing matches the include pattern '/opt/plesk/php/7.4/etc/php-fpm.d/*.conf' from /opt/plesk/php/7.4/etc/php-fpm.conf
Dec 03 14:37:35 srvurb01.urbaman.it php-fpm[5615]: [03-Dec-2019 14:37:35] ERROR: No pool defined. at least one pool section must be specified in config file
Dec 03 14:37:35 srvurb01.urbaman.it php-fpm[5615]: [03-Dec-2019 14:37:35] ERROR: failed to post process the configuration
Dec 03 14:37:35 srvurb01.urbaman.it php-fpm[5615]: [03-Dec-2019 14:37:35] ERROR: FPM initialization failed
Dec 03 14:37:35 srvurb01.urbaman.it systemd[1]: plesk-php74-fpm.service: Main process exited, code=exited, status=78/n/a
Dec 03 14:37:35 srvurb01.urbaman.it systemd[1]: plesk-php74-fpm.service: Failed with result 'exit-code'.
Dec 03 14:37:35 srvurb01.urbaman.it systemd[1]: Failed to start The PHP 7.4.0 FastCGI Process Manager.