“Our sandbox was recently refreshed. Production uses SSO. We are unable to log in to the refreshed sandbox using username/password, and the Forgot Password function returns: ‘Your account isn't set up yet.

 “Our sandbox was recently refreshed. Production uses SSO. We are unable to log in to the refreshed sandbox using username/password, and the Forgot Password function returns: ‘Your account isn't set up yet. Your Salesforce admin can help with that.’ Please reset the password for the Sandbox System Administrator so we can access the sandbox without SSO.” Even admin's also unable to login.