when registering with username and password it is required to click on the link in the mail to approve the mail.
As a Google User this step is not required, the user is approved immediatly in Auth0.
Can this behaviour be changed for Google Users?
I understand you are asking about Google Social Connection users and the email_verified profile attribute.
The behavior is as follows:
When users authenticate with a federated identity provider (e.g. a social or enterprise connection), the value of the email_verified field will match what the identity provider returns in the user profile. If they identity provider does not return any value, it will be set to false .
In this case, it sounds like your google user has already had their email verified by the IdP.