This message is on my WEB page
That I am not using the correct PHP version
Fatal error: Composer detected issues in your platform: Your Composer dependencies require a PHP version ">= 7.4.0". You are running 5.6.40-57+ubuntu18.04.1+deb.sury.org+1. in /var/www/html/admin/libraries/Composer/vendor/composer/platform_check.php on line 25
And you webserver is always ‘on’ whatever user you tell it to be. . . But that’s not the point, the way you set up your webserver includes telling it what modules to load, currently you are telling it to load php5.6. Fix that and your problems will not be the same.