diff --git a/homeassistant/components/lametric/config_flow.py b/homeassistant/components/lametric/config_flow.py
index 734f42e03b00..fd45306c84ce 100644
--- a/homeassistant/components/lametric/config_flow.py
+++ b/homeassistant/components/lametric/config_flow.py
@@ -201,6 +201,8 @@ class LaMetricFlowHandler(AbstractOAuth2FlowHandler, domain=DOMAIN):
                 )
             except AbortFlow:
                 raise
+            except LaMetricAuthenticationError:
+                errors["base"] = "invalid_auth"
             except LaMetricConnectionError as ex:
                 LOGGER.error("Error connecting to LaMetric: %s", ex)
                 errors["base"] = "cannot_connect"
@@ -267,6 +269,8 @@ class LaMetricFlowHandler(AbstractOAuth2FlowHandler, domain=DOMAIN):
                 )
             except AbortFlow:
                 raise
+            except LaMetricAuthenticationError:
+                errors["base"] = "invalid_auth"
             except LaMetricConnectionError as ex:
                 LOGGER.error("Error connecting to LaMetric: %s", ex)
                 errors["base"] = "cannot_connect"
diff --git a/tests/components/lametric/test_config_flow.py b/tests/components/lametric/test_config_flow.py
index ae78a312218b..192429ca1d12 100644
--- a/tests/components/lametric/test_config_flow.py
+++ b/tests/components/lametric/test_config_flow.py
@@ -545,6 +545,7 @@ async def test_cloud_abort_no_devices(
 @pytest.mark.parametrize(
     ("side_effect", "reason"),
     [
+        (LaMetricAuthenticationError, "invalid_auth"),
         (LaMetricConnectionTimeoutError, "cannot_connect"),
         (LaMetricConnectionError, "cannot_connect"),
         (LaMetricError, "unknown"),
@@ -605,6 +606,7 @@ async def test_manual_errors(
 @pytest.mark.parametrize(
     ("side_effect", "reason"),
     [
+        (LaMetricAuthenticationError, "invalid_auth"),
         (LaMetricConnectionTimeoutError, "cannot_connect"),
         (LaMetricConnectionError, "cannot_connect"),
         (LaMetricError, "unknown"),