With the launch of Drupal 9, one of the requirements is for MySQL 5.7 or later.
- If using Drupal 9 with MySQL or Percona, version 5.7.8+ is required.
- If using Drupal 9 with MariaDB, version 10.3.7+ is required.
What I discovered is the the version of MySQL that ships by default with Centos is constrained to 5.5*. To find my current version of MySQL: