diff --git a/lib/reducers/user-reducer.js b/lib/reducers/user-reducer.js
index 4abf35ee6..4fc72c9b0 100644
--- a/lib/reducers/user-reducer.js
+++ b/lib/reducers/user-reducer.js
@@ -1,416 +1,475 @@
 // @flow
 
 import _isEqual from 'lodash/fp/isEqual.js';
 import _keyBy from 'lodash/fp/keyBy.js';
 
 import { setClientDBStoreActionType } from '../actions/client-db-store-actions.js';
 import { siweAuthActionTypes } from '../actions/siwe-actions.js';
 import {
   joinThreadActionTypes,
   newThreadActionTypes,
 } from '../actions/thread-actions.js';
 import {
+  deleteAccountActionTypes,
+  keyserverAuthActionTypes,
   logOutActionTypes,
   deleteKeyserverAccountActionTypes,
   logInActionTypes,
   keyserverRegisterActionTypes,
   setUserSettingsActionTypes,
   updateUserAvatarActionTypes,
   resetUserStateActionType,
 } from '../actions/user-actions.js';
 import { setNewSessionActionType } from '../keyserver-conn/keyserver-conn-types.js';
 import {
   convertUserInfosToReplaceUserOps,
   type UserStoreOperation,
   userStoreOpsHandlers,
 } from '../ops/user-store-ops.js';
 import { stateSyncSpecs } from '../shared/state-sync/state-sync-specs.js';
 import { updateSpecs } from '../shared/updates/update-specs.js';
 import type { BaseAction } from '../types/redux-types.js';
 import type { ClientUserInconsistencyReportCreationRequest } from '../types/report-types.js';
 import {
   serverRequestTypes,
   processServerRequestsActionType,
 } from '../types/request-types.js';
 import {
   fullStateSyncActionType,
   incrementalStateSyncActionType,
 } from '../types/socket-types.js';
 import { updateTypes } from '../types/update-types-enum.js';
 import { processUpdatesActionType } from '../types/update-types.js';
 import type { ClientUpdateInfo } from '../types/update-types.js';
 import type {
   CurrentUserInfo,
   UserInfos,
   UserStore,
 } 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,
   action: BaseAction,
 ): ?CurrentUserInfo {
   if (
     action.type === logInActionTypes.success ||
     action.type === siweAuthActionTypes.success ||
     action.type === keyserverRegisterActionTypes.success ||
     action.type === logOutActionTypes.success ||
     action.type === deleteKeyserverAccountActionTypes.success
   ) {
     if (!_isEqual(action.payload.currentUserInfo)(state)) {
       return action.payload.currentUserInfo;
     }
   } else if (
     action.type === setNewSessionActionType &&
     action.payload.sessionChange.currentUserInfo
   ) {
     const { sessionChange } = action.payload;
     if (!_isEqual(sessionChange.currentUserInfo)(state)) {
       return sessionChange.currentUserInfo;
     }
   } else if (action.type === fullStateSyncActionType) {
     const { currentUserInfo } = action.payload;
     if (!_isEqual(currentUserInfo)(state)) {
       return currentUserInfo;
     }
   } else if (
     action.type === incrementalStateSyncActionType ||
     action.type === processUpdatesActionType
   ) {
     return action.payload.updatesResult.newUpdates.reduce(
       (reducedState, update) => {
         const { reduceCurrentUser } = updateSpecs[update.type];
         return reduceCurrentUser
           ? reduceCurrentUser(reducedState, update)
           : reducedState;
       },
       state,
     );
   } else if (action.type === processServerRequestsActionType) {
     const checkStateRequest = action.payload.serverRequests.find(
       candidate => candidate.type === serverRequestTypes.CHECK_STATE,
     );
     const newCurrentUserInfo = checkStateRequest?.stateChanges?.currentUserInfo;
     if (newCurrentUserInfo && !_isEqual(newCurrentUserInfo)(state)) {
       return newCurrentUserInfo;
     }
   } else if (
     action.type === updateUserAvatarActionTypes.success &&
     state &&
     !state.anonymous
   ) {
     const { viewerUpdates } = action.payload.updates;
     for (const update of viewerUpdates) {
       if (
         update.type === updateTypes.UPDATE_CURRENT_USER &&
         !_isEqual(update.currentUserInfo.avatar)(state.avatar)
       ) {
         return {
           ...state,
           avatar: update.currentUserInfo.avatar,
         };
       }
     }
     return state;
   } else if (action.type === setUserSettingsActionTypes.success) {
     if (state?.settings) {
       return {
         ...state,
         settings: {
           ...state.settings,
           ...action.payload,
         },
       };
     }
   } else if (action.type === resetUserStateActionType) {
     state = state && state.anonymous ? state : null;
   }
   return state;
 }
 
 function assertUserStoresAreEqual(
   processedUserStore: UserInfos,
   expectedUserStore: UserInfos,
   location: string,
   onStateDifference: (message: string) => mixed,
 ) {
   try {
     assertObjectsAreEqual(
       processedUserStore,
       expectedUserStore,
       `UserInfos - ${location}`,
     );
   } catch (e) {
     console.log(
       'Error processing UserStore ops',
       processedUserStore,
       expectedUserStore,
     );
     const message = `Error processing UserStore ops ${
       getMessageForException(e) ?? '{no exception message}'
     }`;
     onStateDifference(message);
   }
 }
 
 const { processStoreOperations: processUserStoreOps } = userStoreOpsHandlers;
 
 function generateOpsForUserUpdates(payload: {
   +updatesResult: { +newUpdates: $ReadOnlyArray<ClientUpdateInfo>, ... },
   ...
 }): $ReadOnlyArray<UserStoreOperation> {
   return payload.updatesResult.newUpdates
     .map(update =>
       updateSpecs[update.type].generateOpsForUserInfoUpdates?.(update),
     )
     .filter(Boolean)
     .flat();
 }
 
 function reduceUserInfos(
   state: UserStore,
   action: BaseAction,
   onStateDifference: (message: string) => mixed,
 ): [
   UserStore,
   $ReadOnlyArray<ClientUserInconsistencyReportCreationRequest>,
   $ReadOnlyArray<UserStoreOperation>,
 ] {
   if (
     action.type === joinThreadActionTypes.success ||
     action.type === newThreadActionTypes.success
   ) {
     const newUserInfos: UserInfos = _keyBy(userInfo => userInfo.id)(
       action.payload.userInfos,
     );
 
     const userStoreOps: $ReadOnlyArray<UserStoreOperation> =
       convertUserInfosToReplaceUserOps(newUserInfos);
     const processedUserInfos: UserInfos = processUserStoreOps(
       state.userInfos,
       userStoreOps,
     );
     const updated: UserInfos = { ...state.userInfos, ...newUserInfos };
     assertUserStoresAreEqual(
       processedUserInfos,
       updated,
       action.type,
       onStateDifference,
     );
 
     if (!_isEqual(state.userInfos)(updated)) {
       return [
         {
           ...state,
           userInfos: updated,
         },
         [],
         userStoreOps,
       ];
     }
   } else if (
     action.type === logOutActionTypes.success ||
-    action.type === deleteKeyserverAccountActionTypes.success ||
-    (action.type === setNewSessionActionType &&
-      action.payload.sessionChange.cookieInvalidated)
+    action.type === deleteAccountActionTypes.success
+  ) {
+    const userStoreOps: $ReadOnlyArray<UserStoreOperation> = [
+      { type: 'remove_all_users' },
+    ];
+    const processedUserInfos: UserInfos = processUserStoreOps(
+      state.userInfos,
+      userStoreOps,
+    );
+    assertUserStoresAreEqual(
+      processedUserInfos,
+      {},
+      action.type,
+      onStateDifference,
+    );
+
+    if (Object.keys(state.userInfos).length === 0) {
+      return [state, [], []];
+    }
+    return [
+      {
+        userInfos: {},
+      },
+      [],
+      userStoreOps,
+    ];
+  } else if (
+    action.type === setNewSessionActionType &&
+    action.payload.sessionChange.cookieInvalidated &&
+    !usingCommServicesAccessToken
   ) {
     const userStoreOps: $ReadOnlyArray<UserStoreOperation> = [
       { type: 'remove_all_users' },
     ];
     const processedUserInfos: UserInfos = processUserStoreOps(
       state.userInfos,
       userStoreOps,
     );
     assertUserStoresAreEqual(
       processedUserInfos,
       {},
       action.type,
       onStateDifference,
     );
 
     if (Object.keys(state.userInfos).length === 0) {
       return [state, [], []];
     }
     return [
       {
         userInfos: {},
       },
       [],
       userStoreOps,
     ];
   } else if (
     action.type === logInActionTypes.success ||
     action.type === siweAuthActionTypes.success ||
     action.type === keyserverRegisterActionTypes.success ||
     action.type === fullStateSyncActionType
   ) {
     const newUserInfos = _keyBy(userInfo => userInfo.id)(
       action.payload.userInfos,
     );
     const userStoreOps: $ReadOnlyArray<UserStoreOperation> = [
       { type: 'remove_all_users' },
       ...convertUserInfosToReplaceUserOps(newUserInfos),
     ];
     const processedUserInfos: UserInfos = processUserStoreOps(
       state.userInfos,
       userStoreOps,
     );
     assertUserStoresAreEqual(
       processedUserInfos,
       newUserInfos,
       action.type,
       onStateDifference,
     );
     if (
       action.type === logInActionTypes.success ||
       action.type === siweAuthActionTypes.success ||
       action.type === keyserverRegisterActionTypes.success ||
       !_isEqual(state.userInfos)(newUserInfos)
     ) {
       return [
         {
           userInfos: newUserInfos,
         },
         [],
         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
   ) {
     const newUserInfos = _keyBy(userInfo => userInfo.id)(
       action.payload.userInfos,
     );
     const userStoreOps: $ReadOnlyArray<UserStoreOperation> = [
       ...convertUserInfosToReplaceUserOps(newUserInfos),
       ...generateOpsForUserUpdates(action.payload),
     ];
     const updated = action.payload.updatesResult.newUpdates.reduce(
       (reducedState, update) => {
         const { reduceUserInfos: reduceUserInfosUpdate } =
           updateSpecs[update.type];
         return reduceUserInfosUpdate
           ? reduceUserInfosUpdate(reducedState, update)
           : reducedState;
       },
       { ...state.userInfos, ...newUserInfos },
     );
 
     const processedUserInfos: UserInfos = processUserStoreOps(
       state.userInfos,
       userStoreOps,
     );
     assertUserStoresAreEqual(
       processedUserInfos,
       updated,
       action.type,
       onStateDifference,
     );
     if (!_isEqual(state.userInfos)(updated)) {
       return [
         {
           ...state,
           userInfos: updated,
         },
         [],
         userStoreOps,
       ];
     }
   } else if (action.type === processServerRequestsActionType) {
     const checkStateRequest = action.payload.serverRequests.find(
       candidate => candidate.type === serverRequestTypes.CHECK_STATE,
     );
     if (!checkStateRequest || !checkStateRequest.stateChanges) {
       return [state, [], []];
     }
     const { userInfos, deleteUserInfoIDs } = checkStateRequest.stateChanges;
     if (!userInfos && !deleteUserInfoIDs) {
       return [state, [], []];
     }
 
     const userStoreOps: UserStoreOperation[] = [];
     const newUserInfos = { ...state.userInfos };
     if (userInfos) {
       for (const userInfo of userInfos) {
         newUserInfos[userInfo.id] = userInfo;
         userStoreOps.push({ type: 'replace_user', payload: { ...userInfo } });
       }
     }
     if (deleteUserInfoIDs) {
       for (const deleteUserInfoID of deleteUserInfoIDs) {
         delete newUserInfos[deleteUserInfoID];
       }
       userStoreOps.push({
         type: 'remove_users',
         payload: { ids: deleteUserInfoIDs },
       });
     }
 
     const processedUserInfos: UserInfos = processUserStoreOps(
       state.userInfos,
       userStoreOps,
     );
     assertUserStoresAreEqual(
       processedUserInfos,
       newUserInfos,
       action.type,
       onStateDifference,
     );
 
     const newInconsistencies = stateSyncSpecs.users.findStoreInconsistencies(
       action,
       state.userInfos,
       newUserInfos,
     );
     return [
       {
         userInfos: newUserInfos,
       },
       newInconsistencies,
       userStoreOps,
     ];
   } else if (action.type === updateUserAvatarActionTypes.success) {
     const newUserInfos = _keyBy(userInfo => userInfo.id)(
       action.payload.updates.userInfos,
     );
     const userStoreOps: $ReadOnlyArray<UserStoreOperation> =
       convertUserInfosToReplaceUserOps(newUserInfos);
     const processedUserInfos: UserInfos = processUserStoreOps(
       state.userInfos,
       userStoreOps,
     );
     const updated: UserInfos = { ...state.userInfos, ...newUserInfos };
     assertUserStoresAreEqual(
       processedUserInfos,
       updated,
       action.type,
       onStateDifference,
     );
     const newState = !_isEqual(state.userInfos)(updated)
       ? {
           ...state,
           userInfos: updated,
         }
       : state;
     return [newState, [], userStoreOps];
   } else if (action.type === setClientDBStoreActionType) {
     if (!action.payload.users) {
       return [state, [], []];
     }
     // Once the functionality is confirmed to work correctly,
     // we will proceed with returning the users from the payload.
     assertUserStoresAreEqual(
       action.payload.users ?? {},
       state.userInfos,
       action.type,
       onStateDifference,
     );
     return [state, [], []];
   }
 
   return [state, [], []];
 }
 
 export { reduceCurrentUserInfo, reduceUserInfos };