Recently, our team figured out that we cannot able to search via custom fields. I visited some of the forums and figured that the field should be in the organization library to show to the whole team, but unfortunately, I did confirm that the field is already in the organization library
That’s right, that’s expected behaviour. I am not entirely sure if it works but maybe a member can do a search and copy the search link then share it: maybe the guest will be able to access it. I never tried, curious to see the result.