In case your users are not able to register on the app, it is probably because user registration is disabled on your WooCommerce website.
Follow the steps below to enable user registration on your WooCommerce website:
Your app will now allow user registration.
AppMySite supports the core functionality of WooCommerce websites, which includes user login and registration. If customers register on your website, they will simply be able to login to the app, and vice versa.