Function Get-ListItems([Microsoft.SharePoint.Client.ClientContext]$Context, [String]$ListTitle) {
    $list = $Context.Web.Lists.GetByTitle($ListTitle)
    $items = $list.GetItems([Microsoft.SharePoint.Client.CamlQuery]::CreateAllItemsQuery())
    $Context.Load($items)
    $Context.ExecuteQuery()
    return $items
}

#set environment
$targetsite = "https://sites/testsite"
$targetlist = "testlist"

$adminUsername = "admin@account"
$secureAdminPassword = Read-Host -AsSecureString "please enter password"

#ask the user to log in
$usercredentials = Get-Credential
#creating sharepiont credentials object

#$sharepointcred = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($usercredentials.UserName, $usercredentials.Password)
$sharepointcred = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($adminUsername, $secureAdminPassword)
#tried both


#create context
$Context = New-Object Microsoft.SharePoint.Client.ClientContext($targetsite)
#assign sharepoint credentials to context
$Context.Credentials = $sharepointcred
#read list
$list = Get-ListItems -Context $Context -ListTitle $targetlist

$items = Get-ListItems -Context $context -ListTitle $targetlist
foreach($item in $items)
{
   Write-Host $item.Title
}