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
@@ -2,7 +2,7 @@
 
 import reduceConnectionInfo from './connection-reducer.js';
 import { reduceDeviceToken } from './device-token-reducer.js';
-import reduceLastCommunicatedPlatformDetails from './last-communicated-platform-details-reducer.js';
+import { updateLastCommunicatedPlatformDetailsActionType } from '../actions/device-actions.js';
 import {
   addKeyserverActionType,
   removeKeyserverActionType,
@@ -13,6 +13,7 @@
   resetUserStateActionType,
   logOutActionTypes,
   deleteAccountActionTypes,
+  registerActionTypes,
 } from '../actions/user-actions.js';
 import type { KeyserverStore } from '../types/keyserver-types';
 import type { BaseAction } from '../types/redux-types.js';
@@ -22,6 +23,7 @@
 } from '../types/socket-types.js';
 import { processUpdatesActionType } from '../types/update-types.js';
 import { setNewSessionActionType } from '../utils/action-utils.js';
+import { getConfig } from '../utils/config.js';
 import { setURLPrefix } from '../utils/url-utils.js';
 import { ashoatKeyserverID } from '../utils/validation-utils.js';
 
@@ -101,6 +103,7 @@
           [keyserverID]: {
             ...state.keyserverInfos[keyserverID],
             updatesCurrentAsOf: updatesCurrentAsOf[keyserverID],
+            lastCommunicatedPlatformDetails: getConfig().platformDetails,
           },
         },
       };
@@ -156,12 +159,31 @@
         },
       },
     };
+  } else if (action.type === updateLastCommunicatedPlatformDetailsActionType) {
+    const { keyserverID, platformDetails } = action.payload;
+    state = {
+      ...state,
+      keyserverInfos: {
+        ...state.keyserverInfos,
+        [keyserverID]: {
+          ...state.keyserverInfos[keyserverID],
+          lastCommunicatedPlatformDetails: platformDetails,
+        },
+      },
+    };
+  } else if (action.type === registerActionTypes.success) {
+    state = {
+      ...state,
+      keyserverInfos: {
+        ...state.keyserverInfos,
+        [ashoatKeyserverID]: {
+          ...state.keyserverInfos[ashoatKeyserverID],
+          lastCommunicatedPlatformDetails: getConfig().platformDetails,
+        },
+      },
+    };
   }
 
-  const lastCommunicatedPlatformDetails = reduceLastCommunicatedPlatformDetails(
-    state.keyserverInfos[ashoatKeyserverID].lastCommunicatedPlatformDetails,
-    action,
-  );
   const connection = reduceConnectionInfo(
     state.keyserverInfos[ashoatKeyserverID].connection,
     action,
@@ -172,8 +194,6 @@
   );
   if (
     connection !== state.keyserverInfos[ashoatKeyserverID].connection ||
-    lastCommunicatedPlatformDetails !==
-      state.keyserverInfos[ashoatKeyserverID].lastCommunicatedPlatformDetails ||
     deviceToken !== state.keyserverInfos[ashoatKeyserverID].deviceToken
   ) {
     state = {
@@ -183,7 +203,6 @@
         [ashoatKeyserverID]: {
           ...state.keyserverInfos[ashoatKeyserverID],
           connection,
-          lastCommunicatedPlatformDetails,
           deviceToken,
         },
       },
diff --git a/lib/reducers/last-communicated-platform-details-reducer.js b/lib/reducers/last-communicated-platform-details-reducer.js
deleted file mode 100644
--- a/lib/reducers/last-communicated-platform-details-reducer.js
+++ /dev/null
@@ -1,28 +0,0 @@
-// @flow
-
-import { updateLastCommunicatedPlatformDetailsActionType } from '../actions/device-actions.js';
-import { siweAuthActionTypes } from '../actions/siwe-actions.js';
-import {
-  logInActionTypes,
-  registerActionTypes,
-} from '../actions/user-actions.js';
-import type { PlatformDetails } from '../types/device-types';
-import type { BaseAction } from '../types/redux-types';
-import { getConfig } from '../utils/config.js';
-
-export default function reduceLastCommunicatedPlatformDetails(
-  state: ?PlatformDetails,
-  action: BaseAction,
-): ?PlatformDetails {
-  if (
-    action.type === logInActionTypes.success ||
-    action.type === siweAuthActionTypes.success ||
-    action.type === registerActionTypes.success
-  ) {
-    return getConfig().platformDetails;
-  }
-  if (action.type === updateLastCommunicatedPlatformDetailsActionType) {
-    return action.payload;
-  }
-  return state;
-}
diff --git a/lib/socket/socket.react.js b/lib/socket/socket.react.js
--- a/lib/socket/socket.react.js
+++ b/lib/socket/socket.react.js
@@ -601,7 +601,10 @@
     if (shouldSendInitialPlatformDetails) {
       this.props.dispatch({
         type: updateLastCommunicatedPlatformDetailsActionType,
-        payload: getConfig().platformDetails,
+        payload: {
+          platformDetails: getConfig().platformDetails,
+          keyserverID: ashoatKeyserverID,
+        },
       });
     }
 
diff --git a/lib/types/device-types.js b/lib/types/device-types.js
--- a/lib/types/device-types.js
+++ b/lib/types/device-types.js
@@ -41,6 +41,11 @@
   +stateVersion?: number,
 };
 
+export type LastCommunicatedPlatformDetails = {
+  +platformDetails: PlatformDetails,
+  +keyserverID: string,
+};
+
 export type VersionResponse = {
   +codeVersion: number,
   +ownerUsername: ?string,
diff --git a/lib/types/redux-types.js b/lib/types/redux-types.js
--- a/lib/types/redux-types.js
+++ b/lib/types/redux-types.js
@@ -20,7 +20,7 @@
 import type { CryptoStore } from './crypto-types.js';
 import type {
   GetVersionActionPayload,
-  PlatformDetails,
+  LastCommunicatedPlatformDetails,
 } from './device-types.js';
 import type { ClientDBDraftInfo, DraftStore } from './draft-types.js';
 import type { EnabledApps, SupportedApps } from './enabled-apps.js';
@@ -1183,7 +1183,7 @@
     }
   | {
       +type: 'UPDATE_LAST_COMMUNICATED_PLATFORM_DETAILS',
-      +payload: PlatformDetails,
+      +payload: LastCommunicatedPlatformDetails,
     }
   | { +type: 'RESET_USER_STATE', +payload?: void }
   | {
diff --git a/lib/utils/action-utils.js b/lib/utils/action-utils.js
--- a/lib/utils/action-utils.js
+++ b/lib/utils/action-utils.js
@@ -239,6 +239,7 @@
         dispatch,
         options,
         false,
+        keyserverID,
       );
       if (callServerEndpointCallback) {
         callServerEndpointCallback(!!newSessionChange);
@@ -412,6 +413,7 @@
       dispatch,
       options,
       loggedIn,
+      keyserverID,
     );
 }
 
diff --git a/lib/utils/call-server-endpoint.js b/lib/utils/call-server-endpoint.js
--- a/lib/utils/call-server-endpoint.js
+++ b/lib/utils/call-server-endpoint.js
@@ -92,6 +92,7 @@
   dispatch: Dispatch,
   options?: ?CallServerEndpointOptions,
   loggedIn: boolean,
+  keyserverID: string,
 ): Promise<Object> {
   const possibleReplacement = await waitIfCookieInvalidated();
   if (possibleReplacement) {
@@ -210,7 +211,7 @@
   if (!error && shouldSendPlatformDetails) {
     dispatch({
       type: updateLastCommunicatedPlatformDetailsActionType,
-      payload: getConfig().platformDetails,
+      payload: { platformDetails: getConfig().platformDetails, keyserverID },
     });
   }