diff --git a/frontend/src/components/account/CreateAccountModal.vue b/frontend/src/components/account/CreateAccountModal.vue
index cff7ae1c59..49ea1a1401 100644
--- a/frontend/src/components/account/CreateAccountModal.vue
+++ b/frontend/src/components/account/CreateAccountModal.vue
@@ -2870,7 +2870,7 @@ import ProxySelector from '@/components/common/ProxySelector.vue'
 import GroupSelector from '@/components/common/GroupSelector.vue'
 import ModelWhitelistSelector from '@/components/account/ModelWhitelistSelector.vue'
 import QuotaLimitCard from '@/components/account/QuotaLimitCard.vue'
-import { applyInterceptWarmup } from '@/components/account/credentialsBuilder'
+import { applyInterceptWarmup, applyRefreshTokenFallback } from '@/components/account/credentialsBuilder'
 import { formatDateTimeLocalInput, parseDateTimeLocalInput } from '@/utils/format'
 import { createStableObjectKeyResolver } from '@/utils/stableObjectKey'
 import {
@@ -4405,6 +4405,7 @@ const handleOpenAIBatchRT = async (refreshTokenInput: string, clientId?: string)
         }
 
         const credentials = oauthClient.buildCredentials(tokenInfo)
+        applyRefreshTokenFallback(credentials, refreshTokens[i])
         if (clientId) {
           credentials.client_id = clientId
         }
diff --git a/frontend/src/components/account/__tests__/credentialsBuilder.spec.ts b/frontend/src/components/account/__tests__/credentialsBuilder.spec.ts
index be2a8d521c..98bdacf7bc 100644
--- a/frontend/src/components/account/__tests__/credentialsBuilder.spec.ts
+++ b/frontend/src/components/account/__tests__/credentialsBuilder.spec.ts
@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest'
-import { applyInterceptWarmup } from '../credentialsBuilder'
+import { applyInterceptWarmup, applyRefreshTokenFallback } from '../credentialsBuilder'
 
 describe('applyInterceptWarmup', () => {
   it('create + enabled=true: should set intercept_warmup_requests to true', () => {
@@ -44,3 +44,23 @@ describe('applyInterceptWarmup', () => {
     expect('intercept_warmup_requests' in creds).toBe(false)
   })
 })
+
+describe('applyRefreshTokenFallback', () => {
+  it('adds the original refresh token when credentials do not include one', () => {
+    const creds: Record<string, unknown> = { access_token: 'tok' }
+    applyRefreshTokenFallback(creds, 'rt-original')
+    expect(creds.refresh_token).toBe('rt-original')
+  })
+
+  it('does not overwrite a refresh token returned by the upstream response', () => {
+    const creds: Record<string, unknown> = { access_token: 'tok', refresh_token: 'rt-new' }
+    applyRefreshTokenFallback(creds, 'rt-original')
+    expect(creds.refresh_token).toBe('rt-new')
+  })
+
+  it('ignores empty fallback refresh tokens', () => {
+    const creds: Record<string, unknown> = { access_token: 'tok' }
+    applyRefreshTokenFallback(creds, '   ')
+    expect('refresh_token' in creds).toBe(false)
+  })
+})
diff --git a/frontend/src/components/account/credentialsBuilder.ts b/frontend/src/components/account/credentialsBuilder.ts
index b8008e8bfb..d15609e59a 100644
--- a/frontend/src/components/account/credentialsBuilder.ts
+++ b/frontend/src/components/account/credentialsBuilder.ts
@@ -9,3 +9,16 @@ export function applyInterceptWarmup(
     delete credentials.intercept_warmup_requests
   }
 }
+
+export function applyRefreshTokenFallback(
+  credentials: Record<string, unknown>,
+  refreshToken: string
+): void {
+  const fallback = refreshToken.trim()
+  const current =
+    typeof credentials.refresh_token === 'string' ? credentials.refresh_token.trim() : ''
+
+  if (!current && fallback) {
+    credentials.refresh_token = fallback
+  }
+}