How to Bulk Update Users Employee ID from an Excel File on Active Directory using Powershell

Something like this:

Import-Csv |
    ForEach-Object{
        $e = Get-ADUser -filter "employeeno = '$_.'EMPLOYEE NO'"
        if ($e){
            $e | Set-ADUser -EmployeeID $_.'NameOfEmployeeIDColumnInCSV'
        }
    }

I don't see anything in the CSV that can be used as an Identity in the Get-ADUser, so I used a filter and "employeeno" as the AD property name -- you should verify that it's the correct property name. If there's a column in your spreadsheet that has can be used as a unique Identity (distinguished name, objectGUID, objectSid, or saMAccountName) then you should eliminate the need for the Get-ADUser and just use a Set-ADUser with the "-Identity" parameter.