diff --git a/lib/handlers/user-infos-handler.react.js b/lib/handlers/user-infos-handler.react.js
--- a/lib/handlers/user-infos-handler.react.js
+++ b/lib/handlers/user-infos-handler.react.js
@@ -70,7 +70,9 @@
       // 1. Fetch usernames from identity
       const promise = (async () => {
         newUserIDs.forEach(id => requestedIDsRef.current.add(id));
-        const { identities } = await findUserIdentities(newUserIDs);
+        const { identities, reservedUserIdentifiers } =
+          await findUserIdentities(newUserIDs);
+
         newUserIDs.forEach(id => requestedIDsRef.current.delete(id));
 
         const newUserInfos = [];
@@ -80,6 +82,12 @@
             username: identities[id].username,
           });
         }
+        for (const id in reservedUserIdentifiers) {
+          newUserInfos.push({
+            id,
+            username: reservedUserIdentifiers[id],
+          });
+        }
         return { userInfos: newUserInfos };
       })();
       void dispatchActionPromise(findUserIdentitiesActionTypes, promise);
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
@@ -225,6 +225,27 @@
     .flat();
 }
 
+function discardKeyserverUsernames(
+  newUserInfos: UserInfos,
+  stateUserInfos: UserInfos,
+): UserInfos {
+  if (!usingCommServicesAccessToken) {
+    return newUserInfos;
+  }
+  let result: UserInfos = {};
+  for (const id in newUserInfos) {
+    const username = stateUserInfos[id] ? stateUserInfos[id].username : null;
+    result = {
+      ...result,
+      [id]: {
+        ...newUserInfos[id],
+        username,
+      },
+    };
+  }
+  return result;
+}
+
 type ReduceUserInfosResult = [
   UserStore,
   $ReadOnlyArray<ClientUserInconsistencyReportCreationRequest>,
@@ -241,7 +262,11 @@
   if (payload.keyserverID !== authoritativeKeyserverID()) {
     return [state, [], []];
   }
-  const newUserInfos = _keyBy(userInfo => userInfo.id)(payload.userInfos);
+  const keyserverUserInfos = _keyBy(userInfo => userInfo.id)(payload.userInfos);
+  const newUserInfos = discardKeyserverUsernames(
+    keyserverUserInfos,
+    state.userInfos,
+  );
 
   const userStoreOps: $ReadOnlyArray<UserStoreOperation> = [
     ...convertUserInfosToReplaceUserOps(newUserInfos),
@@ -318,9 +343,13 @@
     if (keyserverID !== authoritativeKeyserverID()) {
       return [state, [], []];
     }
-    const newUserInfos: UserInfos = _keyBy(userInfo => userInfo.id)(
+    const keyserverUserInfos: UserInfos = _keyBy(userInfo => userInfo.id)(
       action.payload.userInfos,
     );
+    const newUserInfos = discardKeyserverUsernames(
+      keyserverUserInfos,
+      state.userInfos,
+    );
 
     const userStoreOps: $ReadOnlyArray<UserStoreOperation> =
       convertUserInfosToReplaceUserOps(newUserInfos);
@@ -401,9 +430,13 @@
     if (action.payload.keyserverID !== authoritativeKeyserverID()) {
       return [state, [], []];
     }
-    const newUserInfos = _keyBy(userInfo => userInfo.id)(
+    const keyserverUserInfos = _keyBy(userInfo => userInfo.id)(
       action.payload.userInfos,
     );
+    const newUserInfos = discardKeyserverUsernames(
+      keyserverUserInfos,
+      state.userInfos,
+    );
     const userStoreOps: $ReadOnlyArray<UserStoreOperation> = [
       { type: 'remove_all_users' },
       ...convertUserInfosToReplaceUserOps(newUserInfos),
@@ -450,9 +483,13 @@
     action.type === keyserverAuthActionTypes.success &&
     relyingOnAuthoritativeKeyserver
   ) {
-    const newUserInfos = _keyBy(userInfo => userInfo.id)(
+    const keyserverUserInfos = _keyBy(userInfo => userInfo.id)(
       action.payload.userInfos,
     );
+    const newUserInfos = discardKeyserverUsernames(
+      keyserverUserInfos,
+      state.userInfos,
+    );
 
     const userStoreOps: $ReadOnlyArray<UserStoreOperation> =
       convertUserInfosToReplaceUserOps(newUserInfos);
@@ -503,12 +540,15 @@
       return [state, [], []];
     }
 
-    const userStoreOps: UserStoreOperation[] = [];
-    if (userInfos) {
-      for (const userInfo of userInfos) {
-        userStoreOps.push({ type: 'replace_user', payload: { ...userInfo } });
-      }
-    }
+    const keyserverUserInfos = _keyBy(userInfo => userInfo.id)(userInfos);
+    const newUserInfos = discardKeyserverUsernames(
+      keyserverUserInfos,
+      state.userInfos,
+    );
+
+    const userStoreOps: UserStoreOperation[] = [
+      ...convertUserInfosToReplaceUserOps(newUserInfos),
+    ];
 
     if (deleteUserInfoIDs) {
       userStoreOps.push({
@@ -553,9 +593,13 @@
       userStoreOps,
     ];
   } else if (action.type === updateUserAvatarActionTypes.success) {
-    const newUserInfos = _keyBy(userInfo => userInfo.id)(
+    const keyserverUserInfos = _keyBy(userInfo => userInfo.id)(
       action.payload.updates.userInfos,
     );
+    const newUserInfos = discardKeyserverUsernames(
+      keyserverUserInfos,
+      state.userInfos,
+    );
     const userStoreOps: $ReadOnlyArray<UserStoreOperation> =
       convertUserInfosToReplaceUserOps(newUserInfos);
     const processedUserInfos: UserInfos = processUserStoreOps(