load locations to prevent 'unknown error occurred'

homeassistant/components/totalconnect/config_flow.py

@@ -4,6 +4,7 @@ import voluptuous as vol
 
 from homeassistant import config_entries
 from homeassistant.const import CONF_PASSWORD, CONF_USERNAME
+from homeassistant.exceptions import HomeAssistantError
 
 from .const import CONF_USERCODES, DOMAIN
 
@@ -88,6 +89,14 @@ class TotalConnectConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
                     },
                 )
         else:
+            # Force the loading of locations using I/O
+            number_locations = await self.hass.async_add_executor_job(
+                self.client.get_number_locations,
+            )
+            if number_locations < 1:
+                raise HomeAssistantError(
+                    "There are no locations enabled or available for this TotalConnect user."
+                )
             for location_id in self.client.locations:
                 self.usercodes[location_id] = None