diff --git a/lib/types/identity-service-types.js b/lib/types/identity-service-types.js
--- a/lib/types/identity-service-types.js
+++ b/lib/types/identity-service-types.js
@@ -236,15 +236,6 @@
   +notifOneTimeKeys: $ReadOnlyArray<string>,
 };
 
-export type IdentityExistingDeviceKeyUpload = {
-  +keyPayload: string,
-  +keyPayloadSignature: string,
-  +contentPrekey: string,
-  +contentPrekeySignature: string,
-  +notifPrekey: string,
-  +notifPrekeySignature: string,
-};
-
 // Device list types
 
 export type RawDeviceList = {
diff --git a/web/grpc/identity-service-client-wrapper.js b/web/grpc/identity-service-client-wrapper.js
--- a/web/grpc/identity-service-client-wrapper.js
+++ b/web/grpc/identity-service-client-wrapper.js
@@ -19,7 +19,6 @@
   type UserDevicesOlmOutboundKeys,
   type IdentityAuthResult,
   type IdentityNewDeviceKeyUpload,
-  type IdentityExistingDeviceKeyUpload,
   identityAuthResultValidator,
   type UserDevicesOlmInboundKeys,
   type DeviceOlmInboundKeys,
@@ -63,14 +62,12 @@
   authClient: ?IdentityAuthClient.IdentityClientServicePromiseClient;
   unauthClient: IdentityUnauthClient.IdentityClientServicePromiseClient;
   getNewDeviceKeyUpload: () => Promise<IdentityNewDeviceKeyUpload>;
-  getExistingDeviceKeyUpload: () => Promise<IdentityExistingDeviceKeyUpload>;
 
   constructor(
     platformDetails: PlatformDetails,
     overridedOpaqueFilepath: string,
     authLayer: ?IdentityServiceAuthLayer,
     getNewDeviceKeyUpload: () => Promise<IdentityNewDeviceKeyUpload>,
-    getExistingDeviceKeyUpload: () => Promise<IdentityExistingDeviceKeyUpload>,
   ) {
     this.overridedOpaqueFilepath = overridedOpaqueFilepath;
     this.platformDetails = platformDetails;
@@ -83,7 +80,6 @@
     this.unauthClient =
       IdentityServiceClientWrapper.createUnauthClient(platformDetails);
     this.getNewDeviceKeyUpload = getNewDeviceKeyUpload;
-    this.getExistingDeviceKeyUpload = getExistingDeviceKeyUpload;
   }
 
   static determineSocketAddr(): string {
@@ -351,14 +347,14 @@
     }
 
     const [identityDeviceKeyUpload] = await Promise.all([
-      this.getExistingDeviceKeyUpload(),
+      this.getNewDeviceKeyUpload(),
       initOpaque(this.overridedOpaqueFilepath),
     ]);
 
     const opaqueLogin = new Login();
     const startRequestBytes = opaqueLogin.start(password);
 
-    const deviceKeyUpload = authExistingDeviceKeyUpload(
+    const deviceKeyUpload = authNewDeviceKeyUpload(
       this.platformDetails,
       identityDeviceKeyUpload,
     );
@@ -420,8 +416,8 @@
     siweMessage: string,
     siweSignature: string,
   ) => {
-    const identityDeviceKeyUpload = await this.getExistingDeviceKeyUpload();
-    const deviceKeyUpload = authExistingDeviceKeyUpload(
+    const identityDeviceKeyUpload = await this.getNewDeviceKeyUpload();
+    const deviceKeyUpload = authNewDeviceKeyUpload(
       this.platformDetails,
       identityDeviceKeyUpload,
     );
@@ -806,41 +802,6 @@
   return deviceKeyUpload;
 }
 
-function authExistingDeviceKeyUpload(
-  platformDetails: PlatformDetails,
-  uploadData: IdentityExistingDeviceKeyUpload,
-): DeviceKeyUpload {
-  const {
-    keyPayload,
-    keyPayloadSignature,
-    contentPrekey,
-    contentPrekeySignature,
-    notifPrekey,
-    notifPrekeySignature,
-  } = uploadData;
-
-  const identityKeyInfo = createIdentityKeyInfo(
-    keyPayload,
-    keyPayloadSignature,
-  );
-
-  const contentPrekeyUpload = createPrekey(
-    contentPrekey,
-    contentPrekeySignature,
-  );
-
-  const notifPrekeyUpload = createPrekey(notifPrekey, notifPrekeySignature);
-
-  const deviceKeyUpload = createDeviceKeyUpload(
-    platformDetails,
-    identityKeyInfo,
-    contentPrekeyUpload,
-    notifPrekeyUpload,
-  );
-
-  return deviceKeyUpload;
-}
-
 function createIdentityKeyInfo(
   keyPayload: string,
   keyPayloadSignature: string,
diff --git a/web/shared-worker/worker/identity-client.js b/web/shared-worker/worker/identity-client.js
--- a/web/shared-worker/worker/identity-client.js
+++ b/web/shared-worker/worker/identity-client.js
@@ -2,10 +2,7 @@
 
 import type { PlatformDetails } from 'lib/types/device-types.js';
 
-import {
-  getNewDeviceKeyUpload,
-  getExistingDeviceKeyUpload,
-} from './worker-crypto.js';
+import { getNewDeviceKeyUpload } from './worker-crypto.js';
 import { IdentityServiceClientWrapper } from '../../grpc/identity-service-client-wrapper.js';
 import {
   type WorkerResponseMessage,
@@ -34,7 +31,6 @@
       message.opaqueWasmPath,
       message.authLayer,
       async () => getNewDeviceKeyUpload(),
-      async () => getExistingDeviceKeyUpload(),
     );
     return undefined;
   }
diff --git a/web/shared-worker/worker/worker-crypto.js b/web/shared-worker/worker/worker-crypto.js
--- a/web/shared-worker/worker/worker-crypto.js
+++ b/web/shared-worker/worker/worker-crypto.js
@@ -19,10 +19,7 @@
   type OutboundSessionCreationResult,
 } from 'lib/types/crypto-types.js';
 import type { PlatformDetails } from 'lib/types/device-types.js';
-import type {
-  IdentityNewDeviceKeyUpload,
-  IdentityExistingDeviceKeyUpload,
-} from 'lib/types/identity-service-types.js';
+import type { IdentityNewDeviceKeyUpload } from 'lib/types/identity-service-types.js';
 import type { OlmSessionInitializationInfo } from 'lib/types/olm-session-types.js';
 import type { InboundP2PMessage } from 'lib/types/sqlite-types.js';
 import { getMessageForException } from 'lib/utils/errors.js';
@@ -33,7 +30,6 @@
   getAccountPrekeysSet,
   shouldForgetPrekey,
   shouldRotatePrekey,
-  retrieveIdentityKeysAndPrekeys,
   olmSessionErrors,
 } from 'lib/utils/olm-utils.js';
 
@@ -441,33 +437,6 @@
   };
 }
 
-async function getExistingDeviceKeyUpload(): Promise<IdentityExistingDeviceKeyUpload> {
-  if (!cryptoStore) {
-    throw new Error('Crypto account not initialized');
-  }
-  const { contentAccount } = cryptoStore;
-  const [notifsCryptoAccount, signedIdentityKeysBlob] = await Promise.all([
-    getNotifsCryptoAccount(),
-    getSignedIdentityKeysBlob(),
-  ]);
-
-  const { prekey: contentPrekey, prekeySignature: contentPrekeySignature } =
-    retrieveIdentityKeysAndPrekeys(contentAccount);
-  const { prekey: notifPrekey, prekeySignature: notifPrekeySignature } =
-    retrieveIdentityKeysAndPrekeys(notifsCryptoAccount.notificationAccount);
-
-  await persistCryptoStore(notifsCryptoAccount);
-
-  return {
-    keyPayload: signedIdentityKeysBlob.payload,
-    keyPayloadSignature: signedIdentityKeysBlob.signature,
-    contentPrekey,
-    contentPrekeySignature,
-    notifPrekey,
-    notifPrekeySignature,
-  };
-}
-
 function getNotifsPersistenceKeys(
   cookie: ?string,
   keyserverID: string,
@@ -1026,5 +995,4 @@
   processAppOlmApiRequest,
   getSignedIdentityKeysBlob,
   getNewDeviceKeyUpload,
-  getExistingDeviceKeyUpload,
 };