Woocommerce Customer is activated but not registered anywhere

I have an issue with Woocommerce Customers registration.

The users would register, receive an activation link and activate the account with the success notification. After that the users cannot login (“Error: no such user email”).

In the admin part there is a tab with Customers, and it has a correct count of those customers registered. But when you click it, it’s empty. Although, the administrators and shop managers roles are displayed normally.

The data about the customers seems to be fully stored in wp_usermeta db table. But the wp_users table only contains the administrators.

Can you please give a hint how those registered customers can be made visible to admin and also how to enable them finally login with all the details that they already entered previously.

Megathanks in advance.