diff --git a/keyserver/src/responders/website-responders.js b/keyserver/src/responders/website-responders.js
--- a/keyserver/src/responders/website-responders.js
+++ b/keyserver/src/responders/website-responders.js
@@ -508,6 +508,7 @@
           updatesCurrentAsOf,
           urlPrefix,
           connection: defaultConnectionInfo,
+          lastCommunicatedPlatformDetails: null,
         },
       },
     };
diff --git a/lib/reducers/keyserver-reducer.js b/lib/reducers/keyserver-reducer.js
--- a/lib/reducers/keyserver-reducer.js
+++ b/lib/reducers/keyserver-reducer.js
@@ -1,6 +1,7 @@
 // @flow
 
 import reduceConnectionInfo from './connection-reducer.js';
+import reduceLastCommunicatedPlatformDetails from './last-communicated-platform-details-reducer.js';
 import reduceUpdatesCurrentAsOf from './updates-reducer.js';
 import { siweAuthActionTypes } from '../actions/siwe-actions.js';
 import {
@@ -90,11 +91,19 @@
     };
   }
 
+  const lastCommunicatedPlatformDetails = reduceLastCommunicatedPlatformDetails(
+    state.keyserverInfos[ashoatKeyserverID].lastCommunicatedPlatformDetails,
+    action,
+  );
   const connection = reduceConnectionInfo(
     state.keyserverInfos[ashoatKeyserverID].connection,
     action,
   );
-  if (connection !== state.keyserverInfos[ashoatKeyserverID].connection) {
+  if (
+    connection !== state.keyserverInfos[ashoatKeyserverID].connection ||
+    lastCommunicatedPlatformDetails !==
+      state.keyserverInfos[ashoatKeyserverID].lastCommunicatedPlatformDetails
+  ) {
     state = {
       ...state,
       keyserverInfos: {
@@ -102,6 +111,7 @@
         [ashoatKeyserverID]: {
           ...state.keyserverInfos[ashoatKeyserverID],
           connection,
+          lastCommunicatedPlatformDetails,
         },
       },
     };
diff --git a/lib/types/keyserver-types.js b/lib/types/keyserver-types.js
--- a/lib/types/keyserver-types.js
+++ b/lib/types/keyserver-types.js
@@ -2,9 +2,10 @@
 
 import t, { type TInterface } from 'tcomb';
 
+import type { PlatformDetails } from './device-types.js';
 import { connectionInfoValidator } from './socket-types.js';
 import type { ConnectionInfo } from './socket-types.js';
-import { tShape } from '../utils/validation-utils.js';
+import { tShape, tPlatformDetails } from '../utils/validation-utils.js';
 
 // Once we start using the cookie field on web,
 // the cookie field should be mandatory, of type ?string.
@@ -15,6 +16,7 @@
   +updatesCurrentAsOf: number, // millisecond timestamp
   +urlPrefix: string,
   +connection: ConnectionInfo,
+  +lastCommunicatedPlatformDetails: ?PlatformDetails,
 };
 
 export type KeyserverStore = {
@@ -28,6 +30,7 @@
     updatesCurrentAsOf: t.Number,
     urlPrefix: t.String,
     connection: connectionInfoValidator,
+    lastCommunicatedPlatformDetails: t.maybe(tPlatformDetails),
   });
 
 export const keyserverStoreValidator: TInterface<KeyserverStore> =
diff --git a/native/redux/redux-setup.js b/native/redux/redux-setup.js
--- a/native/redux/redux-setup.js
+++ b/native/redux/redux-setup.js
@@ -128,6 +128,7 @@
         updatesCurrentAsOf: 0,
         urlPrefix: defaultURLPrefix,
         connection: defaultConnectionInfo,
+        lastCommunicatedPlatformDetails: null,
       },
     },
   },