Certainly, let's explore this further.
As long as external Identity Providers (IDPs) follow the specific IDP standard, Okta is able to support them. For additional information, please visit the Okta Developer Website.
SurePassID offers a variety of Identity Providers (IDPs) such as SAML2, OpenID Connect, and an ADFS plug-in. The SurePassID IDPs offer a combination of traditional and modern (MFA resistant to phishing) authentication methods. You can choose any of these SurePassID IDPs to integrate modern authentication into Okta's platform.