I am using Get-AzRoleAssignment to get RBAC details for Data Lake Storage Gen1 resource.
Command :
Get-AzRoleAssignment -ResourceGroupName "test" -ResourceName "testResource" -ResourceType "Microsoft.DataLakeAnalytics/accounts"
Above command gives us list of resources who have access to resource mentioned. Since first use of this command we have removed access for many resources but command still return names for those. I logged out and logged in multiple times to check if its caching issue but no use.