public static void putYubiKeyMultipleDeviceRegistrationEnabled(final RequestContext requestContext, final boolean enabled) {
        requestContext.getFlowScope().put("yubikeyMultipleDeviceRegistrationEnabled", enabled);
    }
Put yubikey multiple device registration enabled.

@param requestContext the request context
@param enabled        the enabled
core/cas-server-core-webflow-mfa-api/src/main/java/org/apereo/cas/web/flow/util/MultifactorAuthenticationWebflowUtils.java