diff --git a/lib/selectors/keyserver-selectors.js b/lib/selectors/keyserver-selectors.js
--- a/lib/selectors/keyserver-selectors.js
+++ b/lib/selectors/keyserver-selectors.js
@@ -2,6 +2,7 @@
 
 import { createSelector } from 'reselect';
 
+import type { PlatformDetails } from '../types/device-types';
 import type { KeyserverInfo } from '../types/keyserver-types';
 import type { AppState } from '../types/redux-types.js';
 import type { ConnectionInfo } from '../types/socket-types.js';
@@ -42,6 +43,12 @@
   state: AppState,
 ) => state.keyserverStore.keyserverInfos[ashoatKeyserverID]?.connection;
 
+const lastCommunicatedPlatformDetailsSelector: (
+  state: AppState,
+) => ?PlatformDetails = (state: AppState) =>
+  state.keyserverStore.keyserverInfos[ashoatKeyserverID]
+    ?.lastCommunicatedPlatformDetails;
+
 export {
   cookieSelector,
   cookiesSelector,
@@ -50,4 +57,5 @@
   currentAsOfSelector,
   urlPrefixSelector,
   connectionSelector,
+  lastCommunicatedPlatformDetailsSelector,
 };
diff --git a/lib/selectors/server-calls.js b/lib/selectors/server-calls.js
--- a/lib/selectors/server-calls.js
+++ b/lib/selectors/server-calls.js
@@ -7,6 +7,7 @@
   sessionIDSelector,
   urlPrefixSelector,
   connectionSelector,
+  lastCommunicatedPlatformDetailsSelector,
 } from './keyserver-selectors.js';
 import type { PlatformDetails } from '../types/device-types.js';
 import type { AppState } from '../types/redux-types.js';
@@ -32,7 +33,7 @@
     sessionIDSelector,
     (state: AppState) => state.currentUserInfo,
     connectionSelector,
-    (state: AppState) => state.lastCommunicatedPlatformDetails,
+    lastCommunicatedPlatformDetailsSelector,
     (
       cookie: ?string,
       urlPrefix: ?string,
diff --git a/native/socket.react.js b/native/socket.react.js
--- a/native/socket.react.js
+++ b/native/socket.react.js
@@ -10,6 +10,7 @@
   cookieSelector,
   urlPrefixSelector,
   connectionSelector,
+  lastCommunicatedPlatformDetailsSelector,
 } from 'lib/selectors/keyserver-selectors.js';
 import { isLoggedIn } from 'lib/selectors/user-selectors.js';
 import { accountHasPassword } from 'lib/shared/account-utils.js';
@@ -100,7 +101,7 @@
     }, [active, navContext]);
 
     const lastCommunicatedPlatformDetails = useSelector(
-      state => state.lastCommunicatedPlatformDetails,
+      lastCommunicatedPlatformDetailsSelector,
     );
 
     const dispatch = useDispatch();
diff --git a/web/socket.react.js b/web/socket.react.js
--- a/web/socket.react.js
+++ b/web/socket.react.js
@@ -10,6 +10,7 @@
   cookieSelector,
   urlPrefixSelector,
   connectionSelector,
+  lastCommunicatedPlatformDetailsSelector,
 } from 'lib/selectors/keyserver-selectors.js';
 import Socket, { type BaseSocketProps } from 'lib/socket/socket.react.js';
 import {
@@ -65,7 +66,7 @@
     const callLogOut = useServerCall(logOut);
 
     const lastCommunicatedPlatformDetails = useSelector(
-      state => state.lastCommunicatedPlatformDetails,
+      lastCommunicatedPlatformDetailsSelector,
     );
 
     return (