Hello,
As your WooCommerce registration page is missing. Please navigate to Woocommerce > Settings > Account and privacy > enable Allow customers to create an account on the “My Account” page
Also you need to make sure that you have my account page with the below shortcode:
[woocommerce_my_account]
That specific account page must be selected from the “My account page” dropdown from WooCommerce >> Settings >> My account page.
Screenshot for clarification:
https://jmp.sh/63NHzBk
After doing this also check your dashboard pages after clearing your site and browser cache.
Best Regards.