In the Create Geodatabase Administrator tool help, it is noted that you can no longer create user-schema geodatabases and just wondering what the recommended workaround for this is using ArcGIS Pro 3.x
Hello @DeanHowell_GA, User-Schema Geodatabases in Oracle were deprecated a while ago, around version 10.7, so that message is quite old.
If you want to use Multiple Geodatabases in Oracle, you can use one of the methods described here.
Multiple geodatabases in Oracle—ArcMap | Documentation (arcgis.com)