Grant Full Control to Service Application in SharePoint

Adds a claims user to a Service Application with Full Control

function Add-User-To-Service-Application-Administrators([string] $account, [string] $serviceApplication)
{
    $principal = New-SPClaimsPrincipal $account -IdentityType WindowsSamAccountName
    $spapp = Get-SPServiceApplication -Name $serviceApplication
    $security = Get-SPServiceApplicationSecurity $spapp -Admin

    Grant-SPObjectSecurity $security $principal "Full Control"
    Set-SPServiceApplicationSecurity $spapp $security -Admin
    #(Get-SPServiceApplicationSecurity $spapp -Admin).AccessRules
}



Add-User-To-Service-Application-Administrators "DEV\SPAppPool" "User Profile Service Application"