It looks like the formatting was removed. Here it is again:

function Get-PagedAppUsers {

  $totalAppUsers = 0

  $params = @{appid = "0oa1a44x18tLiG9IK0h8"; limit = 20}

  do {

    $page = Get-OktaAppUsers @params

    $appusers = $page.objects

    foreach ($appuser in $appusers) {

      Write-Host $appuser.credentials.userName

      $totalAppUsers++

    }

    $params = @{url = $page.nextUrl}

  } while ($page.nextUrl)

  "$totalAppUsers app users found."

}