How Can you use an organization's locator that isn't on AGOL

[JepchumbaKoech]

I've created a survey in the Survey123 Connect app and would like to use my organization's locator. The locator is public but not in AGOL, it's in our organization's portal. How would I use that locator in my survey? Previous examples show people listing the item ID of the locator service but this locator doesn't have one because it's not hosted on AGOL. 

[abureaux]

Have you tried to Configure a proxy locator item as described here?

Also worth noting, but I believe that all public surveys are hard-coded to use the default ArcGIS World Geocoder service.