Hi @jibrazil,
Unfortunately, as @sumansaurav mentioned, you won’t be able to disable the email verification using a pre-user registration Action. Additionally, the post-user registration Action will not work here either since it happens after the user is created.
Note that after a user is created, it will automatically send the welcome email and verification email (if enabled). Therefore, the only way to ensure that the verification email is not sent is to create the users manually using the Management API’s create a user endpoint and passing in the verify_email=false body parameter.
Thanks,
Rueben