Exception Not Working

I have an observer for sales_order_save_before <?php namespace Veratad\AgeVerification\Observer; use Magento\Framework\ObjectManager\ObjectManager; use Magento\Framework\Exception\CouldNotSaveException; class ProcessOrder implements \Magento\Framework\Event\ObserverInterface { protected $ _veratadCall; protected $ customerSession; protected $ _isExcluded; private $ scopeConfig;…