diff --git a/lib/selectors/user-selectors.js b/lib/selectors/user-selectors.js
--- a/lib/selectors/user-selectors.js
+++ b/lib/selectors/user-selectors.js
@@ -9,7 +9,10 @@
   getRandomDefaultEmojiAvatar,
 } from '../shared/avatar-utils.js';
 import { getSingleOtherUser } from '../shared/thread-utils.js';
-import { type AuxUserInfos } from '../types/aux-user-types.js';
+import {
+  type AuxUserInfos,
+  type AuxUserInfo,
+} from '../types/aux-user-types.js';
 import type { ClientEmojiAvatar } from '../types/avatar-types';
 import type {
   RelativeMemberInfo,
@@ -25,6 +28,7 @@
   AccountUserInfo,
   CurrentUserInfo,
 } from '../types/user-types.js';
+import { entries } from '../utils/objects.js';
 
 // Used for specific message payloads that include an array of user IDs, ie.
 // array of initial users, array of added users
@@ -218,6 +222,26 @@
     ),
 );
 
+// Foreign Peer Devices are all devices of users we are aware of,
+// but not our own devices.
+const getForeignPeerDevices: (state: BaseAppState<>) => $ReadOnlyArray<string> =
+  createSelector(
+    (state: BaseAppState<>) => state.auxUserStore.auxUserInfos,
+    (state: BaseAppState<>) =>
+      state.currentUserInfo && state.currentUserInfo.id,
+    (
+      auxUserInfos: AuxUserInfos,
+      currentUserID: ?string,
+    ): $ReadOnlyArray<string> =>
+      entries(auxUserInfos)
+        .map(([userID, auxUserInfo]: [string, AuxUserInfo]) =>
+          userID !== currentUserID && auxUserInfo.deviceList?.devices
+            ? auxUserInfo.deviceList.devices
+            : [],
+        )
+        .flat(),
+  );
+
 export {
   userIDsToRelativeUserInfos,
   getRelativeMemberInfos,
@@ -229,4 +253,5 @@
   savedEmojiAvatarSelectorForCurrentUser,
   getRelativeUserIDs,
   usersWithMissingDeviceListSelector,
+  getForeignPeerDevices,
 };
diff --git a/lib/tunnelbroker/use-peer-to-peer-message-handler.js b/lib/tunnelbroker/use-peer-to-peer-message-handler.js
--- a/lib/tunnelbroker/use-peer-to-peer-message-handler.js
+++ b/lib/tunnelbroker/use-peer-to-peer-message-handler.js
@@ -4,6 +4,11 @@
 import _isEqual from 'lodash/fp/isEqual.js';
 import * as React from 'react';
 
+import {
+  useBroadcastDeviceListUpdates,
+  useGetAndUpdateDeviceListsForUsers,
+} from '../hooks/peer-list-hooks.js';
+import { getForeignPeerDevices } from '../selectors/user-selectors.js';
 import {
   verifyAndGetDeviceList,
   removeDeviceFromDeviceList,
@@ -20,6 +25,7 @@
 import { getMessageForException } from '../utils/errors.js';
 import { hasHigherDeviceID, olmSessionErrors } from '../utils/olm-utils.js';
 import { getClientMessageIDFromTunnelbrokerMessageID } from '../utils/peer-to-peer-communication-utils.js';
+import { useSelector } from '../utils/redux-utils.js';
 
 function usePeerToPeerMessageHandler(): (
   message: PeerToPeerMessage,
@@ -29,7 +35,11 @@
 
   const identityContext = React.useContext(IdentityClientContext);
   invariant(identityContext, 'Identity context should be set');
-  const { identityClient } = identityContext;
+  const { identityClient, getAuthMetadata } = identityContext;
+
+  const foreignPeerDevices = useSelector(getForeignPeerDevices);
+  const broadcastDeviceListUpdates = useBroadcastDeviceListUpdates();
+  const getAndUpdateDeviceListsForUsers = useGetAndUpdateDeviceListsForUsers();
 
   return React.useCallback(
     async (message: PeerToPeerMessage, messageID: string) => {
@@ -199,6 +209,26 @@
             `Error verifying device list for user ${message.userID}: ${e}`,
           );
         }
+      } else if (
+        message.type === peerToPeerMessageTypes.IDENTITY_DEVICE_LIST_UPDATED
+      ) {
+        try {
+          const { userID } = await getAuthMetadata();
+          if (!userID) {
+            return;
+          }
+
+          await Promise.all([
+            broadcastDeviceListUpdates(foreignPeerDevices),
+            getAndUpdateDeviceListsForUsers([userID]),
+          ]);
+        } catch (e) {
+          console.log(
+            `Error updating device list after Identity request: ${
+              getMessageForException(e) ?? 'unknown error'
+            }`,
+          );
+        }
       } else if (message.type === peerToPeerMessageTypes.MESSAGE_PROCESSED) {
         try {
           const { deviceID, messageID: tunnelbrokerMessageID } = message;
@@ -218,7 +248,15 @@
         }
       }
     },
-    [identityClient, olmAPI, sqliteAPI],
+    [
+      broadcastDeviceListUpdates,
+      foreignPeerDevices,
+      getAndUpdateDeviceListsForUsers,
+      getAuthMetadata,
+      identityClient,
+      olmAPI,
+      sqliteAPI,
+    ],
   );
 }