diff --git a/keyserver/src/responders/user-responders.js b/keyserver/src/responders/user-responders.js
--- a/keyserver/src/responders/user-responders.js
+++ b/keyserver/src/responders/user-responders.js
@@ -18,6 +18,7 @@
 import {
   userSettingsTypes,
   notificationTypeValues,
+  loginActionSourceTypes,
 } from 'lib/types/account-types';
 import { defaultNumberPerThread } from 'lib/types/message-types';
 import type {
@@ -188,6 +189,7 @@
   calendarQuery: t.maybe(entryQueryInputValidator),
   deviceTokenUpdateRequest: t.maybe(deviceTokenUpdateRequestInputValidator),
   platformDetails: tPlatformDetails,
+  source: t.maybe(t.enums.of(values(loginActionSourceTypes))),
 });
 
 async function logInResponder(