FIn zitadel all the attributes are defined by the standard and Zitadel knows exactly how to map. If you are using a SAML provider, you will have to add an action and tell Zitadel how to prefill the attributes.
FThis is also described in the OKTA SAML guide we have in our docs: https://zitadel.com/docs/guides/integrate/identity-providers/okta-saml#add-action-to-map-user-attributes
Fare you sure the action is running?
Fgreat to hear