Changing WP_CONTENT_DIR and WP_CONTENT_URL in wp-config.php does not register?

You have probably added the definitions too late. If in fact you added that “to the end” of wp-config.php then you added it after these lines:

/** Sets up WordPress vars and included files. */
require_once(ABSPATH . 'wp-settings.php');

If so, then those constants are already defined (wp_initial_constants) and you cannot redefine a constant after it is already defined.

Make your edits earlier, before:

/* That's all, stop editing! Happy blogging. */

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