I have a ArcGIS Server 10.7.1 instance with Portal. The private map service does not show in the REST directory page. Telling me that its set to private. But when I use the admin REST api to look at its permissions its telling me its set to Everyone.
return json result
{
permissions: [{
principal: "esriEveryone",
permission: {
isAllowed: true
},
childURL: null,
operation: null
}]
}