diff --git a/src/core/auth/auth.test.ts b/src/core/auth/auth.test.ts
index 62513de9..0c2925b8 100644
--- a/src/core/auth/auth.test.ts
+++ b/src/core/auth/auth.test.ts
@@ -66,6 +66,20 @@ function loginResponse(accessToken = token(), refreshToken = 'refresh-next') {
   }
 }
 
+function domesticOnlyLoginResponse() {
+  return {
+    code: '200',
+    message: 'success',
+    data: {
+      tokenType: 'Bearer',
+      accessToken: token(),
+      expiresIn: 1800,
+      refreshToken: 'refresh-domestic',
+      refreshExpiresIn: 604800,
+    },
+  }
+}
+
 describe('admin auth session', () => {
   beforeEach(() => {
     vi.stubGlobal('localStorage', createMemoryStorage())
@@ -75,6 +89,17 @@ describe('admin auth session', () => {
     mocks.refreshHandler = null
   })
 
+  it('accepts a domestic-only token response when the test environment has no overseas services', async () => {
+    mocks.post.mockResolvedValue(domesticOnlyLoginResponse())
+    mocks.listCurrentPlatformPermissionCodes.mockResolvedValue(['platform:warehouse:list'])
+    const auth = useAuthStore()
+
+    await auth.login('platform_admin', 'password')
+
+    expect(auth.isAuthenticated).toBe(true)
+    expect(auth.refreshToken).toBe('refresh-domestic')
+  })
+
   it('loads permissions from the current authorization endpoint when the JWT only contains identity', async () => {
     mocks.post.mockResolvedValue(loginResponse())
     mocks.listCurrentPlatformPermissionCodes.mockResolvedValue(['platform:warehouse:list'])
diff --git a/src/core/auth/auth.ts b/src/core/auth/auth.ts
index a7191f6c..43ac8374 100644
--- a/src/core/auth/auth.ts
+++ b/src/core/auth/auth.ts
@@ -24,8 +24,8 @@ interface LoginResponse {
   expiresIn: number
   refreshToken: string
   refreshExpiresIn: number
-  overseasAccessToken: string | null
-  overseasExpiresIn: number
+  overseasAccessToken?: string | null
+  overseasExpiresIn?: number
 }
 
 class ExpiredAccessTokenError extends Error {}
@@ -90,7 +90,10 @@ export const useAuthStore = defineStore('admin-auth', () => {
   async function applySession(result: LoginResponse, expectedGeneration: number) {
     const session = sessionFromToken(result.accessToken)
     ensureCurrentGeneration(expectedGeneration)
-    replaceOverseasAccessToken(result.overseasAccessToken, result.overseasExpiresIn)
+    replaceOverseasAccessToken(
+      result.overseasAccessToken ?? null,
+      result.overseasExpiresIn ?? 0,
+    )
     token.value = result.accessToken
     refreshToken.value = result.refreshToken
     user.value = session.user