may I suggest you add here: https://www.mediawiki.org/wiki/Extension:SimpleSAMLphp#Compatibility That 2.1 requires php 8.0 as minimum. https://simplesamlphp.org/docs/stable/simplesamlphp-upgrade-notes-2.1.html
may I suggest you add here: https://www.mediawiki.org/wiki/Extension:SimpleSAMLphp#Compatibility That 2.1 requires php 8.0 as minimum. https://simplesamlphp.org/docs/stable/simplesamlphp-upgrade-notes-2.1.html