If you can't find an address on Circuit, you can try to add the address using latitude:longitude or by long-pressing the map to a pin in the right place.
You can also fix this issue for yourself and other drivers, by adding the missing place on Google Maps. This only takes a few minutes.
As soon as Google has reviewed and approved your changes, they will appear in Circuit as well. Here's more information on how to add a missing place on Google Maps.