Hi, we seem to have a problem adding our new license key into the License Key Manager. Can any Nevron experts help?

When we tried to add in our new license key, there was an error message prompted that the license key (0000) has been revoked & cannot be used again. We couldn't seem to remove the license key (0000) in the Key Manager after acknowledging the error & attempted to add our new license key again. However it still didn't work.