If the token signing key is lost or compromised (which is highly unlikely in a production system, but is possible in a development system), you can clear all of the keys for a specific issuer by using the included Python module as follows:

python vivox_admin.py revoke_keys -shttps://assigned_subdomain.www.vivox.com/api2/ -u your_admin_username -pyour_admin_password -i your_issuer