Need powershell script

What do you have so far? And what is the formatting of the CSV? Is it like below?

userid
----------
user1
user2

yes. exactly

to be able to use my csv file as an input to this script I should replace the part where it says "$users = "jacobd","talonssss"" to be :
Import-Csv -Path "Y:\MissingMembers.csv" | ForEach-Object {<YOUR SCRIPT>}...right?

Yes

$users = import-csv c:\path\to\file.csv

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You might need to use $user.userid depending on how the CSV looks.

I feel I'm almost there but the result is not as I expect, please see attached, is there a way I can direct my search to look into a specific OU name?

Should I replace the part
" $ADUser = Get-ADUser -Identity $user -Properties primarygroup -ErrorAction Stop"
with the
" $ADUser = Get-ADUser -Identity $user -Properties OU -SearchBase 'OU=XYZ' -ErrorAction Stop"

Please confirm
2018-10-23_15-01-31.jpg

Give me the entirety of the code.

You're not piping anything into the identity parameter which means one of the variables is off.

$users = import-csv R:\Groups\Members.csv
foreach ($user in $users)
 {
    try {
        $ADUser = Get-ADUser -Identity $user -Properties OU -SearchBase 'OU=<interestedGroup>,DC=<DOMAIN>,DC=com' -ErrorAction Stop
    }
    catch {
        if ($_ -like "*Cannot find an object with identity: '$user'*") {
            "User '$user' does not exist."
        }
        else {
            "An error occurred: $_"
        }
        continue
    }
    "User '$($ADUser.SamAccountName)' exists and his primary group is $(($aduser.Primarygroup -replace "CN=|,.*") -join ", ")."
}

As Jacob mentioned, you need to use $user.userid. Like this:

$ADUser = Get-ADUser $user.userid ...

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IF your CSV file's header is actually 'User ID' then you will need to use $user."User ID"

$ADUser = Get-ADUser $user."User ID" ...

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Thank you Jacob for your help and I apologize for the delay to reply to you.