diff --git a/homeassistant/components/mqtt/config_flow.py b/homeassistant/components/mqtt/config_flow.py
index d83b88540b2..b3c82dce65e 100644
--- a/homeassistant/components/mqtt/config_flow.py
+++ b/homeassistant/components/mqtt/config_flow.py
@@ -526,8 +526,7 @@ def validate_light_platform_config(user_data: dict[str, Any]) -> dict[str, str]:
     if user_data.get(CONF_MIN_KELVIN, DEFAULT_MIN_KELVIN) >= user_data.get(
         CONF_MAX_KELVIN, DEFAULT_MAX_KELVIN
     ):
-        errors[CONF_MAX_KELVIN] = "max_below_min_kelvin"
-        errors[CONF_MIN_KELVIN] = "max_below_min_kelvin"
+        errors["advanced_settings"] = "max_below_min_kelvin"
     return errors
 
 
@@ -1381,7 +1380,10 @@ def validate_user_input(
         try:
             validator(value)
         except (ValueError, vol.Error, vol.Invalid):
-            errors[field] = data_schema_fields[field].error or "invalid_input"
+            data_schema_field = data_schema_fields[field]
+            errors[data_schema_field.section or field] = (
+                data_schema_field.error or "invalid_input"
+            )
 
     if config_validator is not None:
         if TYPE_CHECKING:
diff --git a/tests/components/mqtt/test_config_flow.py b/tests/components/mqtt/test_config_flow.py
index 81d4960be23..4cfc416c3c9 100644
--- a/tests/components/mqtt/test_config_flow.py
+++ b/tests/components/mqtt/test_config_flow.py
@@ -2858,14 +2858,22 @@ async def test_migrate_of_incompatible_config_entry(
                     },
                     {"state_topic": "invalid_subscribe_topic"},
                 ),
+                (
+                    {
+                        "command_topic": "test-topic",
+                        "light_brightness_settings": {
+                            "brightness_command_topic": "test-topic#invalid"
+                        },
+                    },
+                    {"light_brightness_settings": "invalid_publish_topic"},
+                ),
                 (
                     {
                         "command_topic": "test-topic",
                         "advanced_settings": {"max_kelvin": 2000, "min_kelvin": 2000},
                     },
                     {
-                        "max_kelvin": "max_below_min_kelvin",
-                        "min_kelvin": "max_below_min_kelvin",
+                        "advanced_settings": "max_below_min_kelvin",
                     },
                 ),
             ),