public static void putMultifactorAuthenticationRegisteredDevices(final RequestContext requestContext, final Set accounts) {
        val items = ObjectUtils.defaultIfNull(getMultifactorAuthenticationRegisteredDevices(requestContext), new HashSet<>());
        items.addAll(accounts);
        requestContext.getFlowScope().put("multifactorRegisteredAccounts", items);
    }
Put multifactor authentication registered devices.

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