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Does anyone know why Drush doesn't recognize the Drupal 7 installation when I run drush cache:clear?
It gives me the following error message.
Command cache-rebuild requires Drupal core version 8+ to run.
drush status and drush -d give me the right root and right configuration.
I installed Drush with composer require "drush/drush": "7.x-dev".
As @leymannx said in the comments you should better use drush 8 since it's the recommended version for a drupal 7 site (https://www.drush.org/install/#drupal-compatibility).
If drush --version returns something else than 7.x-dev it means you're using another drush than the one you think. You can go in your website /web directory and execute ../vendor/bin/drush cc to use the one you installed for this project.
which drushanddrush --versionreturn you? You also should better use Drush 8.composer require drush/drush:^8.0.