Please enable the reviews in the Woocommerce > Settings > Products. Also make sure that, Reviews option is enabled in the Product data metabox. https://ibb.co/Bg3zY4W.
If you have any questions feel free to contact us.
Please deactivate all the 3rd party plugins and activate only theme-required plugins on the site and then check the issue. I am sure your issue will be solved. Then Activate the 3rd party plugins one by one and check which plugin is creating the issue for you.
Otherwise, if the issue still exists then keep the 3rd party plugins deactivated and share the WP admin login details of your site so I will check and give you a possible solution.