I'm trying to set the option for 'Enable ownership-based access control on features' on a Feature Service in ArcMap before publishing the service, however, the option is greyed out.
Can anyone suggest a reason why the ownership option isn't available?
I haven't worked with versioning of geodatabases for awhile, but I know that when something is greyed out. It's probably because of your License type. If you can try changing it in your License type in ArcGIS Administrator to Advanced.
I was looking in the documents, you should be work this with Standard. Is the data registered as versioned? Here is the documentation for 10.5.1 regarding Geodatabases versions.