diff --git a/backend/app/services/mobile_notify.py b/backend/app/services/mobile_notify.py
index de3b57b..1d85c46 100644
--- a/backend/app/services/mobile_notify.py
+++ b/backend/app/services/mobile_notify.py
@@ -69,7 +69,12 @@ def _fcm_access_token(service_account_path: str) -> str:
         from google.oauth2 import service_account
         from google.auth.transport.requests import Request
     except ImportError as exc:
-        raise MobileNotConfiguredError("google-auth package is required for FCM") from exc
+        msg = str(exc).lower()
+        if "requests" in msg:
+            raise MobileNotConfiguredError(
+                "FCM: установите пакет requests (pip install requests)"
+            ) from exc
+        raise MobileNotConfiguredError("FCM: установите google-auth") from exc
 
     creds = service_account.Credentials.from_service_account_file(
         service_account_path,
@@ -116,7 +121,19 @@ def _send_fcm_data(
             raise MobileNotConfiguredError("FCM не настроен на сервере")
         return
 
-    access_token = _fcm_access_token(cfg.service_account_path)
+    try:
+        access_token = _fcm_access_token(cfg.service_account_path)
+    except (MobileNotConfiguredError, MobileSendError) as exc:
+        logger.warning("FCM skipped: %s", exc)
+        if require_success:
+            raise
+        return
+    except Exception:
+        logger.exception("FCM token acquisition failed")
+        if require_success:
+            raise MobileSendError("Failed to obtain FCM access token", status_code=502)
+        return
+
     url = f"https://fcm.googleapis.com/v1/projects/{cfg.project_id}/messages:send"
     headers = {
         "Authorization": f"Bearer {access_token}",
diff --git a/backend/app/version.py b/backend/app/version.py
index 84872d1..1b3feb1 100644
--- a/backend/app/version.py
+++ b/backend/app/version.py
@@ -1,5 +1,5 @@
 """Единый источник версии SAC (API, health, логи, OpenAPI)."""
 
 APP_NAME = "Security Alert Center"
-APP_VERSION = "0.9.2"
+APP_VERSION = "0.9.3"
 APP_VERSION_LABEL = f"{APP_NAME} v.{APP_VERSION}"
diff --git a/backend/requirements.txt b/backend/requirements.txt
index ef30cfc..6a8c8ad 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -11,6 +11,7 @@ passlib[bcrypt]>=1.7.4,<2
 python-jose[cryptography]>=3.3.0,<4
 httpx>=0.28.0,<1
 google-auth>=2.36.0,<3
+requests>=2.32.0,<3
 psutil>=6.1.0,<8
 
 # dev
diff --git a/backend/tests/test_mobile_notify.py b/backend/tests/test_mobile_notify.py
new file mode 100644
index 0000000..95ddf1c
--- /dev/null
+++ b/backend/tests/test_mobile_notify.py
@@ -0,0 +1,42 @@
+"""FCM push must not break event ingest."""
+
+from unittest.mock import patch
+
+import pytest
+
+from app.services.mobile_notify import MobileNotConfiguredError, _send_fcm_data
+
+
+def test_send_fcm_data_swallows_token_errors_by_default():
+    with patch(
+        "app.services.mobile_notify._fcm_access_token",
+        side_effect=MobileNotConfiguredError("FCM: install requests"),
+    ):
+        with patch("app.services.mobile_notify.get_effective_fcm_config") as mock_cfg:
+            mock_cfg.return_value.enabled = True
+            mock_cfg.return_value.project_id = "proj"
+            mock_cfg.return_value.service_account_path = "/etc/fcm.json"
+            mock_cfg.return_value.configured = True
+            mock_cfg.return_value.active = True
+            _send_fcm_data(["token"], {"kind": "test"}, title="t", body="b")
+
+
+def test_send_fcm_data_raises_token_errors_when_required():
+    with patch(
+        "app.services.mobile_notify._fcm_access_token",
+        side_effect=MobileNotConfiguredError("FCM: install requests"),
+    ):
+        with patch("app.services.mobile_notify.get_effective_fcm_config") as mock_cfg:
+            mock_cfg.return_value.enabled = True
+            mock_cfg.return_value.project_id = "proj"
+            mock_cfg.return_value.service_account_path = "/etc/fcm.json"
+            mock_cfg.return_value.configured = True
+            mock_cfg.return_value.active = True
+            with pytest.raises(MobileNotConfiguredError):
+                _send_fcm_data(
+                    ["token"],
+                    {"kind": "test"},
+                    title="t",
+                    body="b",
+                    require_success=True,
+                )