diff --git a/homeassistant/components/blink/config_flow.py b/homeassistant/components/blink/config_flow.py
index d969e6a75e21..5c0f8c395c7f 100644
--- a/homeassistant/components/blink/config_flow.py
+++ b/homeassistant/components/blink/config_flow.py
@@ -27,15 +27,17 @@ _LOGGER = logging.getLogger(__name__)
 async def validate_input(blink: Blink) -> None:
     """Validate the user input allows us to connect."""
     try:
-        await blink.start()
+        result = await blink.start()
     except (LoginError, TokenRefreshFailed) as err:
         raise InvalidAuth from err
+    if result is False:
+        raise InvalidAuth
 
 
-async def _send_blink_2fa_pin(blink: Blink, pin: str | None) -> bool:
+async def _send_blink_2fa_pin(blink: Blink, pin: str | None) -> None:
     """Send 2FA pin to blink servers."""
-    await blink.send_2fa_code(pin)
-    return True
+    if not await blink.send_2fa_code(pin):
+        raise InvalidAuth
 
 
 class BlinkConfigFlow(ConfigFlow, domain=DOMAIN):
@@ -104,6 +106,8 @@ class BlinkConfigFlow(ConfigFlow, domain=DOMAIN):
                 errors["base"] = "cannot_connect"
             except TokenRefreshFailed:
                 errors["base"] = "invalid_access_token"
+            except InvalidAuth:
+                errors["base"] = "invalid_auth"
             except Exception:
                 _LOGGER.exception("Unexpected exception")
                 errors["base"] = "unknown"
diff --git a/tests/components/blink/test_config_flow.py b/tests/components/blink/test_config_flow.py
index 848d9a15f24a..c758e0520e02 100644
--- a/tests/components/blink/test_config_flow.py
+++ b/tests/components/blink/test_config_flow.py
@@ -173,6 +173,44 @@ async def test_form_2fa_unknown_error(hass: HomeAssistant) -> None:
     assert result3["errors"] == {"base": "unknown"}
 
 
+async def test_form_2fa_wrong_pin(hass: HomeAssistant) -> None:
+    """Test we report invalid auth when send_2fa_code returns False."""
+
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+
+    with patch(
+        "homeassistant.components.blink.config_flow.Blink.start",
+        side_effect=BlinkTwoFARequiredError,
+    ):
+        result2 = await hass.config_entries.flow.async_configure(
+            result["flow_id"],
+            {"username": "blink@example.com", "password": "example"},
+        )
+
+    assert result2["type"] is FlowResultType.FORM
+    assert result2["step_id"] == "2fa"
+
+    with (
+        patch("homeassistant.components.blink.config_flow.Blink.start"),
+        patch(
+            "homeassistant.components.blink.config_flow.Blink.send_2fa_code",
+            return_value=False,
+        ),
+        patch(
+            "homeassistant.components.blink.async_setup_entry",
+            return_value=True,
+        ),
+    ):
+        result3 = await hass.config_entries.flow.async_configure(
+            result2["flow_id"], {"pin": "1234"}
+        )
+
+    assert result3["type"] is FlowResultType.FORM
+    assert result3["errors"] == {"base": "invalid_auth"}
+
+
 async def test_form_invalid_auth(hass: HomeAssistant) -> None:
     """Test we handle invalid auth."""
     result = await hass.config_entries.flow.async_init(
@@ -191,6 +229,28 @@ async def test_form_invalid_auth(hass: HomeAssistant) -> None:
     assert result2["errors"] == {"base": "invalid_auth"}
 
 
+async def test_form_start_returns_false(hass: HomeAssistant) -> None:
+    """Test we handle auth failure when blink.start() returns False without raising.
+
+    blink.start() catches LoginError/TokenRefreshFailed internally and returns
+    False instead of re-raising, so validate_input must check the return value.
+    """
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+
+    with patch(
+        "homeassistant.components.blink.config_flow.Blink.start",
+        return_value=False,
+    ):
+        result2 = await hass.config_entries.flow.async_configure(
+            result["flow_id"], {"username": "blink@example.com", "password": "example"}
+        )
+
+    assert result2["type"] is FlowResultType.FORM
+    assert result2["errors"] == {"base": "invalid_auth"}
+
+
 async def test_form_unknown_error(hass: HomeAssistant) -> None:
     """Test we handle unknown error at startup."""
     result = await hass.config_entries.flow.async_init(