Do I have to use Multi-Factor Authentication (also known as 2-Step Verification or MFA)?
Perhaps. It will depend on the service you’re accessing. Okta allows Multi-Factor Authentication to be flagged as "required" for each individual service.
As a website or service is upgraded to use Okta for login, the “owner” of that website or service will decide if there is a need for the additional security that Multi-Factor Authentication can provide.