If are unable to reset passwords on the Email Security.cloud ClientNet portal, especially when an account was already a migrated portal user.
The portal user is likely using SSO to log in. Therefore, the user will be able to reset the password.
The account owner or the portal user must either use the self service via Okta to reset their password or use the Log in with Symantec option.
If Broadcom's SSO is being used, go to the login page and click the "Log In with Symantec account" button, as illustrated below.
If the issue still persist, you can contact the Technical Support.