Junos Space does not offer any native support for OKTA and two-factor authentication.

The authentication methods used by the Space server are local, remote, and remote-local.

Users can use RADIUS or TACACS+ server for authentication and authorization of users.

You can see the following documentation for details:

https://www.juniper.net/documentation/us/en/software/junos-space23.1/junos-space-workspaces/topics/concept/junos-space-remote-authentication-modes-understanding.html