script shared mailbox with license

Hello again! Manflo1603 

Great that it works for you 😄 

On this site you can find all the licenses and their SKU numbers (Also called GUID in the list) 
Product names and service plan identifiers for licensing - Azure AD - Microsoft Entra | Microsoft Learn

And for the second question if you want to export this output to a CSV file you could add a PSCustomObject to structure your output in a table format and then export it to a CSV file. 

I've copied your script below and added some modifications to it so you will get a PsCustomObject and then export that, all you need to to is change the variable called $FilePath to the filepath where you want to store the CSV file 

Connect-ExchangeOnline
Connect-AzureAD
$FilePath = "C:\Users\Oliwer\Folder\Export.csv"
$UPNSharedMailbox = Get-Mailbox -recipientTypeDetails SharedMailbox | Select userprincipalname

$CSVReport = @()

foreach ($UPN in $UPNSharedMailbox)
{
    $SharedMailbox = $UPN.userprincipalname
    $Infouser = Get-AzureADUser -ObjectId $SharedMailbox

    if ($infoUser.AssignedLicenses.Count -gt 0 -And $InfoUser.AssignedLicenses.SkuID -Like "cbdc14ab-d96c-4c30-b9f4-6ada7cdc1d46")
    {
        $CSVReport += [pscustomobject][ordered]@{

            User            = $SharedMailbox
            IsLicensed      = "Yes"
        }
    }   
}

$CSVReport | Export-Csv -Path $FilePath -NoTypeInformation

Let me know if this helps or if you have any other questions 😄 

Kind Regards
Oliwer Sundgren