diff --git a/homeassistant/components/otbr/strings.json b/homeassistant/components/otbr/strings.json
index bc7812c1db7..e1afa5b8909 100644
--- a/homeassistant/components/otbr/strings.json
+++ b/homeassistant/components/otbr/strings.json
@@ -13,7 +13,9 @@
       "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]"
     },
     "abort": {
-      "single_instance_allowed": "[%key:common::config_flow::abort::single_instance_allowed%]"
+      "already_configured": "The Thread border router is already configured",
+      "single_instance_allowed": "[%key:common::config_flow::abort::single_instance_allowed%]",
+      "unknown": "[%key:common::config_flow::error::unknown%]"
     }
   },
   "issues": {