diff --git a/homeassistant/components/tts/notify.py b/homeassistant/components/tts/notify.py
index 92244fc41f9..c2576e12bb5 100644
--- a/homeassistant/components/tts/notify.py
+++ b/homeassistant/components/tts/notify.py
@@ -20,16 +20,19 @@ ENTITY_LEGACY_PROVIDER_GROUP = "entity_or_legacy_provider"
 
 _LOGGER = logging.getLogger(__name__)
 
-PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
-    {
-        vol.Required(CONF_NAME): cv.string,
-        vol.Exclusive(CONF_TTS_SERVICE, ENTITY_LEGACY_PROVIDER_GROUP): cv.entity_id,
-        vol.Exclusive(CONF_ENTITY_ID, ENTITY_LEGACY_PROVIDER_GROUP): cv.entities_domain(
-            DOMAIN
-        ),
-        vol.Required(CONF_MEDIA_PLAYER): cv.entity_id,
-        vol.Optional(ATTR_LANGUAGE): cv.string,
-    }
+PLATFORM_SCHEMA = vol.All(
+    cv.has_at_least_one_key(CONF_TTS_SERVICE, CONF_ENTITY_ID),
+    PLATFORM_SCHEMA.extend(
+        {
+            vol.Required(CONF_NAME): cv.string,
+            vol.Exclusive(CONF_TTS_SERVICE, ENTITY_LEGACY_PROVIDER_GROUP): cv.entity_id,
+            vol.Exclusive(
+                CONF_ENTITY_ID, ENTITY_LEGACY_PROVIDER_GROUP
+            ): cv.entities_domain(DOMAIN),
+            vol.Required(CONF_MEDIA_PLAYER): cv.entity_id,
+            vol.Optional(ATTR_LANGUAGE): cv.string,
+        }
+    ),
 )
 
 
diff --git a/tests/components/tts/test_notify.py b/tests/components/tts/test_notify.py
index 22ab151b864..1a776140457 100644
--- a/tests/components/tts/test_notify.py
+++ b/tests/components/tts/test_notify.py
@@ -68,6 +68,21 @@ async def test_setup_platform(hass: HomeAssistant) -> None:
     assert hass.services.has_service(notify.DOMAIN, "tts_test")
 
 
+async def test_setup_platform_missing_key(hass: HomeAssistant) -> None:
+    """Test platform without required tts_service or entity_id key."""
+    config = {
+        notify.DOMAIN: {
+            "platform": "tts",
+            "name": "tts_test",
+            "media_player": "media_player.demo",
+        }
+    }
+    with assert_setup_component(0, notify.DOMAIN):
+        assert await async_setup_component(hass, notify.DOMAIN, config)
+
+    assert not hass.services.has_service(notify.DOMAIN, "tts_test")
+
+
 async def test_setup_legacy_service(hass: HomeAssistant) -> None:
     """Set up the demo platform and call service."""
     calls = async_mock_service(hass, DOMAIN_MP, SERVICE_PLAY_MEDIA)