diff --git a/homeassistant/components/todoist/config_flow.py b/homeassistant/components/todoist/config_flow.py
index 6098df40ea0..b8c79210dfb 100644
--- a/homeassistant/components/todoist/config_flow.py
+++ b/homeassistant/components/todoist/config_flow.py
@@ -44,7 +44,7 @@ class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
                 await api.get_tasks()
             except HTTPError as err:
                 if err.response.status_code == HTTPStatus.UNAUTHORIZED:
-                    errors["base"] = "invalid_access_token"
+                    errors["base"] = "invalid_api_key"
                 else:
                     errors["base"] = "cannot_connect"
             except Exception:  # pylint: disable=broad-except
diff --git a/homeassistant/components/todoist/strings.json b/homeassistant/components/todoist/strings.json
index 68c2305d073..442114eb118 100644
--- a/homeassistant/components/todoist/strings.json
+++ b/homeassistant/components/todoist/strings.json
@@ -9,10 +9,12 @@
       }
     },
     "error": {
-      "invalid_api_key": "[%key:common::config_flow::error::invalid_api_key%]"
+      "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]",
+      "invalid_api_key": "[%key:common::config_flow::error::invalid_api_key%]",
+      "unknown": "[%key:common::config_flow::error::unknown%]"
     },
     "abort": {
-      "already_configured": "[%key:common::config_flow::abort::already_configured_account%]"
+      "single_instance_allowed": "[%key:common::config_flow::abort::single_instance_allowed%]"
     },
     "create_entry": {
       "default": "[%key:common::config_flow::create_entry::authenticated%]"
diff --git a/tests/components/todoist/test_config_flow.py b/tests/components/todoist/test_config_flow.py
index 4175902da31..141f12269de 100644
--- a/tests/components/todoist/test_config_flow.py
+++ b/tests/components/todoist/test_config_flow.py
@@ -69,7 +69,7 @@ async def test_form_invalid_auth(hass: HomeAssistant) -> None:
     )
 
     assert result2.get("type") == FlowResultType.FORM
-    assert result2.get("errors") == {"base": "invalid_access_token"}
+    assert result2.get("errors") == {"base": "invalid_api_key"}
 
 
 @pytest.mark.parametrize("todoist_api_status", [HTTPStatus.INTERNAL_SERVER_ERROR])