diff --git a/lib/reducers/user-reducer.js b/lib/reducers/user-reducer.js
--- a/lib/reducers/user-reducer.js
+++ b/lib/reducers/user-reducer.js
@@ -10,6 +10,7 @@
   newThreadActionTypes,
 } from '../actions/thread-actions.js';
 import {
+  keyserverAuthActionTypes,
   logOutActionTypes,
   deleteKeyserverAccountActionTypes,
   logInActionTypes,
@@ -46,6 +47,7 @@
 } from '../types/user-types.js';
 import { getMessageForException } from '../utils/errors.js';
 import { assertObjectsAreEqual } from '../utils/objects.js';
+import { usingCommServicesAccessToken } from '../utils/services-utils.js';
 
 function reduceCurrentUserInfo(
   state: ?CurrentUserInfo,
@@ -215,6 +217,9 @@
     (action.type === setNewSessionActionType &&
       action.payload.sessionChange.cookieInvalidated)
   ) {
+    if (usingCommServicesAccessToken) {
+      return [state, [], []];
+    }
     const userStoreOps: $ReadOnlyArray<UserStoreOperation> = [
       { type: 'remove_all_users' },
     ];
@@ -276,6 +281,36 @@
         userStoreOps,
       ];
     }
+  } else if (action.type === keyserverAuthActionTypes.success) {
+    const newUserInfos = _keyBy(userInfo => userInfo.id)(
+      action.payload.userInfos,
+    );
+    const mergedUserInfos: UserInfos = { ...state.userInfos, ...newUserInfos };
+
+    const userStoreOps: $ReadOnlyArray<UserStoreOperation> = [
+      ...convertUserInfosToReplaceUserOps(newUserInfos),
+    ];
+    const processedUserInfos: UserInfos = processUserStoreOps(
+      state.userInfos,
+      userStoreOps,
+    );
+    assertUserStoresAreEqual(
+      processedUserInfos,
+      mergedUserInfos,
+      action.type,
+      onStateDifference,
+    );
+
+    if (!_isEqual(state.userInfos)(mergedUserInfos)) {
+      return [
+        {
+          ...state,
+          userInfos: mergedUserInfos,
+        },
+        [],
+        userStoreOps,
+      ];
+    }
   } else if (
     action.type === incrementalStateSyncActionType ||
     action.type === processUpdatesActionType