Users are not linked to the Moodle site on User registration while using Edwiser Bridge plugin.
Users will not be registered to the Moodle site using other WordPress registration page.
You need to use the Edwiser Bridge's user account page for user registration so that the user account is created in WordPress and Moodle simultaneously. The two user accounts ( WordPress and Moodle) will be linked to each other.
Note: If you have a Moodle user account already, then you need to use the same email ID while registration using the Edwiser Bridge's user account page. Only then the newly created user account in WordPress will be linked to the existing Moodle's user account.