So,
first, you need to set up login and registration settings as follows
next
https://dev.wix.com/docs/velo/api-reference/wix-members-backend/authentication/approve-by-token
Check the example “Register a user sending an email for confirmation”
Create register.web.js on backend and fill it with code from example.
last
In order for the user to receive an email with a verification link, it is necessary to use only the emailMember() function from the backend
https://dev.wix.com/docs/velo/api-reference/wix-crm-backend/triggered-emails/email-member
And now it’s working.