The "Map user names" functionality was a big help to us, but ideally we would be able to manage it from the REST API.
You can try to use this undocumented API: $requestBody = @" { "datasourceName":null, "datasourceAnnotation":"{\"dataSourceAnnotationUPNMapping\":{\"connectionStringPropertyName\":1,\"mappingRules\":[]}}", "singleSignOnType":null, "allowDatasourceThroughGateway":null } "@ Invoke-PowerBIRestMethod -Method Patch -Version "v2.0" -Url "me/gatewayClusters/$($DataGateway.Id)/datasources/$($DataSource.Id)" -Body $requestBody
