Oracle Spatial Studio is a web tool for self service access to the spatial features of Oracle Database. Oracle Maps Cloud is a cloud-based map data service for use with licensed Oracle applications and services, including Spatial Studio. Geocoding is one of the Oracle Maps Cloud services used by Spatial Studio. A recent update to Oracle Maps Cloud requires https access, which in turn requires an update to Spatial Studio's default settings. The required update is to change the geocoder URL from http to https in Studio's Console > Settings as shown below:
Once this change is made, geocoding will operate normally.