Problem in user registration email

I recommend getting in touch with WooCommerce’s support about this via https://woocommerce.com/my-account/contact-support/ if you have any of their paid WooCommerce products or https://www.ads-software.com/support/plugin/woocommerce/ if you do not.

Hello there,

You could enable debug mode in order to see what triggers the fatal error, here is article on how to enable debug mode, you can use a plugin if you are not confident in touching the wp-config.php file yourself – https://www.wpbeginner.com/wp-tutorials/how-to-easily-enable-wordpress-debug-mode-to-fix-site-errors/

Please share the fatal error message and let’s see if it can pin-point at the exact problem.

Kind Regards.