Uninstall Password is required to uninstall Symantec Endpoint Protection (SEP) Client even if the uninstall password is not enabled in the Password Policy, or the password has been forgotten.
SEP 14.x
This is caused by SEP policy corruption in the ccsetting which has some remnant from old policy.
Other causes may include forgetting the uninstall password or was set by another administrator who is no longer available to provide it.
Use the following procedure to set a known password: