It is possible the WordPress HTACCESS rules might be missing on your installation. I'd check the .htaccess (hidden file) in the site's root folder, and make sure the WordPress rules are added correctly there as a first step.
wordpress.org
htaccess
The .htaccess is a distributed configuration file, and is how Apache handles configuration changes on a per-directory basis. WordPress uses this file to manipulate how Apache serves files from its root directory, and subdirectories thereof. Most notably, WP modifies this file to be able to...
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