
RicardoM.94865 (Customer) asked a question.
How to add a Country select box to Okta Self Registration form?
How can I add a select box with a list of countries (and the related codes) on the registration form? I'm using the Okta Self Registration form.
Thanks in advance.

https://help.okta.com/en/prod/Content/Topics/Directory/eu-self-service.htm
Configure a self-service registration policy
This is an Early Access feature.
Configure an SSR policy to design and manage the end-user registration experience. You can choose the fields you want to include on the Create Account registration form, specify how those fields are ordered, and mark which of the fields are required.
Not sure if this is what you are searching for, but worth taking a look maybe