The `domain` used in the authorization param used in the example is deprecated and no longer supported.
If it is still used WorkOS returns the error code `domain_connection_selector_not_allowed` with the description:

> 'The `domain` connection selector is deprecated and may no longer be used. Use the `connection` or `organization` connection selectors instead.'

See reference: https://workos.com/docs/reference/sso/get-authorization-url/error-codes#:~:text=domain_connection_selector_not_allowed