diff --git a/homeassistant/components/adax/config_flow.py b/homeassistant/components/adax/config_flow.py
index 166278ef48d..cf845df5e06 100644
--- a/homeassistant/components/adax/config_flow.py
+++ b/homeassistant/components/adax/config_flow.py
@@ -52,8 +52,10 @@ class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
 
         errors = {}
 
+        await self.async_set_unique_id(user_input[ACCOUNT_ID])
+        self._abort_if_unique_id_configured()
+
         try:
-            self._async_abort_entries_match({ACCOUNT_ID: user_input[ACCOUNT_ID]})
             await validate_input(self.hass, user_input)
         except CannotConnect:
             errors["base"] = "cannot_connect"
diff --git a/homeassistant/components/adax/strings.json b/homeassistant/components/adax/strings.json
index 0f7aac83f5a..213e1f95cf9 100644
--- a/homeassistant/components/adax/strings.json
+++ b/homeassistant/components/adax/strings.json
@@ -3,15 +3,13 @@
     "step": {
       "user": {
         "data": {
-          "host": "[%key:common::config_flow::data::host%]",
           "account_id": "Account ID",
           "password": "[%key:common::config_flow::data::password%]"
         }
       }
     },
     "error": {
-      "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]",
-      "invalid_auth": "[%key:common::config_flow::error::invalid_auth%]"
+      "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]"
     },
     "abort": {
       "already_configured": "[%key:common::config_flow::abort::already_configured_device%]"