diff --git a/server-rs/crates/spacetime-module/src/runtime/profile.rs b/server-rs/crates/spacetime-module/src/runtime/profile.rs
index d8adf26c8..462cf0d78 100644
--- a/server-rs/crates/spacetime-module/src/runtime/profile.rs
+++ b/server-rs/crates/spacetime-module/src/runtime/profile.rs
@@ -1631,6 +1631,16 @@ mod tests {
         assert!(result.error_message.is_none());
     }
 
+    #[test]
+    fn invite_code_metadata_tags_are_user_tags() {
+        let tags = profile_invite_code_metadata_user_tags(
+            r#"{"tags":["系统"," beta ","系统"],"channel":"spring"}"#,
+        )
+        .expect("metadata tags should parse");
+
+        assert_eq!(tags, vec!["系统".to_string(), "beta".to_string()]);
+    }
+
     #[test]
     fn recent_public_work_play_counts_group_requested_profiles_in_window() {
         let now_micros = PUBLIC_WORK_PLAY_DAY_MICROS * 10;
@@ -2801,6 +2811,7 @@ fn profile_invite_code_metadata_user_tags(metadata_json: &str) -> Result<Vec<Str
     let tags = metadata
         .get("userTags")
         .or_else(|| metadata.get("user_tags"))
+        .or_else(|| metadata.get("tags"))
         .and_then(JsonValue::as_array)
         .map(|items| {
             items
diff --git a/src/components/auth/AuthGate.test.tsx b/src/components/auth/AuthGate.test.tsx
index 5a7714f6b..92cbe75e8 100644
--- a/src/components/auth/AuthGate.test.tsx
+++ b/src/components/auth/AuthGate.test.tsx
@@ -636,7 +636,7 @@ test('phone login result is not overwritten by an older guest hydrate', async ()
   expect(screen.queryByRole('dialog', { name: '账号入口' })).toBeNull();
 });
 
-test('auth gate hides register entry and opens invite modal for new sms account', async () => {
+test('auth gate auto redeems link invite code for new sms account', async () => {
   const user = userEvent.setup();
   window.history.replaceState(null, '', '/?inviteCode=spring-2026');
   authMocks.getAuthLoginOptions.mockResolvedValue({
@@ -646,7 +646,14 @@ test('auth gate hides register entry and opens invite modal for new sms account'
     token: 'jwt-phone-new',
     user: mockUser,
     created: true,
-    referral: null,
+    referral: {
+      ok: true,
+      message: '邀请码已绑定',
+      inviteeRewardGranted: true,
+      inviterRewardGranted: false,
+      inviteeBalanceAfter: 30,
+      inviterBalanceAfter: 0,
+    },
   });
 
   render(
@@ -674,30 +681,12 @@ test('auth gate hides register entry and opens invite modal for new sms account'
     expect(authMocks.loginWithPhoneCode).toHaveBeenCalledWith(
       '13800000000',
       '123456',
-    );
-  });
-
-  const inviteDialog = await screen.findByRole('dialog', {
-    name: '请填写邀请码',
-  });
-  expect(inviteDialog.className).toContain('platform-auth-card');
-  expect(inviteDialog.className).toContain('platform-modal-shell');
-  const inviteCodeInput = within(inviteDialog).getByLabelText(
-    '邀请码',
-  ) as HTMLInputElement;
-  expect(inviteCodeInput.value).toBe('SPRING2026');
-  expect(inviteCodeInput.className).toContain('platform-text-field');
-  expect(
-    within(inviteDialog).getByRole('button', { name: '提交' }),
-  ).toBeTruthy();
-
-  await user.click(within(inviteDialog).getByRole('button', { name: '提交' }));
-
-  await waitFor(() => {
-    expect(authMocks.redeemRegistrationInviteCode).toHaveBeenCalledWith(
       'SPRING2026',
     );
   });
+
+  expect(screen.queryByRole('dialog', { name: '请填写邀请码' })).toBeNull();
+  expect(authMocks.redeemRegistrationInviteCode).not.toHaveBeenCalled();
 });
 
 test('registration invite modal can skip when invite code is empty', async () => {
diff --git a/src/components/auth/AuthGate.tsx b/src/components/auth/AuthGate.tsx
index 715c72586..80331e5a5 100644
--- a/src/components/auth/AuthGate.tsx
+++ b/src/components/auth/AuthGate.tsx
@@ -966,11 +966,26 @@ export function AuthGate({ children }: AuthGateProps) {
               setLoggingIn(true);
               setError('');
               try {
-                const response = await loginWithPhoneCode(phone, code);
+                const registrationInviteCode =
+                  pendingInviteCode || readInviteCodeFromLocation();
+                const response = registrationInviteCode
+                  ? await loginWithPhoneCode(phone, code, registrationInviteCode)
+                  : await loginWithPhoneCode(phone, code);
+                const autoRedeemedInvite = response.referral?.ok === true;
                 setStoredLastLoginPhone(phone);
                 setLoginCaptchaChallenge(null);
-                setShowRegistrationInviteModal(response.created);
-                setRegistrationInviteError('');
+                setShowRegistrationInviteModal(
+                  response.created && !autoRedeemedInvite,
+                );
+                setRegistrationInviteError(
+                  response.referral?.ok === false
+                    ? (response.referral.message ??
+                        '邀请码绑定失败，请确认后重试。')
+                    : '',
+                );
+                if (autoRedeemedInvite) {
+                  setPendingInviteCode('');
+                }
                 activateReadyUser(response.user);
               } catch (loginError) {
                 setError(