Icingaweb 2 setup cannot find pdo-mysql for PHP

My icinga web setup says the pdo-mysql module is not installed.

However, it is:

yum list installed | grep pdo
rh-php73-php-pdo.x86_64 7.3.33-1.el7 @rhel-server-rhscl-7-rpms

What gives? I’ve hit refresh a few times and restarted httpd, icinga2, and icingadb but nothing seems to work.

did you enable the extension?
did you also install php-mysql?