diff --git a/custom_components/sat/esphome/__init__.py b/custom_components/sat/esphome/__init__.py
index 2212b25e..a459375c 100644
--- a/custom_components/sat/esphome/__init__.py
+++ b/custom_components/sat/esphome/__init__.py
@@ -190,11 +190,27 @@ async def async_set_control_max_setpoint(self, value: float) -> None:
         await self._send_command_value(DATA_MAX_CH_SETPOINT, value)
 
         await super().async_set_control_max_setpoint(value)
-
     def _get_entity_id(self, domain: str, key: str):
-        unique_id = f"{self._mac_address.upper()}-{domain}-{key}"
-        _LOGGER.debug(f"Attempting to find the unique_id of {unique_id}")
-        return self._entity_registry.async_get_entity_id(domain, esphome.DOMAIN, unique_id)
+        mac_upper = self._mac_address.upper()
+        mac_lower = self._mac_address.lower()
+    
+        # Try to find different unique_id generated by ESPHome
+        candidates = [
+            f"{mac_upper}-{domain}-{key}",              # Old format
+            f"{mac_upper}/0/{domain}/{key}",            # ESPHome 2026.10 delimiter is forward slash
+            f"{mac_upper}/0/{domain}/{key.lower()}",
+            f"{mac_lower}/0/{domain}/{key.lower()}",
+            f"{mac_upper}/0/{domain}/{key.upper()}",
+        ]
+    
+        for unique_id in candidates:
+            entity_id = self._entity_registry.async_get_entity_id(domain, esphome.DOMAIN, unique_id)
+            if entity_id:
+                _LOGGER.debug(f"Found {entity_id} with unique_id {unique_id}")
+                return entity_id
+    
+        _LOGGER.warning(f"Could not find entity: domain={domain}, key={key}, mac={self._mac_address}")
+        return None
 
     async def _send_command(self, domain: str, service: str, _key: str, payload: dict):
         """Helper method to send a command to a specified domain and service."""