PowerShell Import CSV to add Active Directory Security Groups - csv

Question

I have a CSV from a client with a few columns in it. A column for Email, SamAccountName, SecurityGroups.
In the Security Group column, each Security Group is separated by a ','
Each row would look like below
User1 User1#email.com SecurityGroup1, SecurityGroup2, SecurityGroup3
User2 User2#email.com SecurityGroup1, SecurityGroup2, SecurityGroup3
User3 User3#email.com SecurityGroup13, SecurityGroup5, SecurityGroup6
A list of users in different Security groups, how do I go about reading the CSV and only adding the Security Groups each user needs.
Below is what I have so far, when I run it in WhatIf mode it adds all the security groups to one user.
Clear
$ADGroup = $null
$i = 0
$ADGroup = import-csv 'File.csv'
$sADGroup = $ADGroup.'Groups required'
Import-CSV "TestUsers.csv" | % {
$SAM = $_.SamAccountName
$ADUser = Get-Aduser -filter {SamAccountName -eq $SAM} -Properties * | Select SamAccountName, MemberOf
Write-Host 'SamAccountName :' $_.SamAccountName ' - ADUser - ' $SAM
$sADGroup | ForEach-Object{
Write-HOst $ADGroup.ADgroup[$i]
Add-ADGroupMember $sADGroup.split(",")[$i] -Members $ADUser.SamAccountName -WhatIf
$i += 1
}
}

Answer 1

Here is the final script, using AD-ADPrincipalGroupMembership was the find, instead of using Add-ADGroupMember
Import-Csv 'testusers.csv' |
ForEach-Object {
add-content $LogFile "Adding User to Group - $($_.Name)"
Try{
Add-ADPrincipalGroupMembership -identity $_.'SamAccountName' -memberof ($_.'Groups' -split', ')
}
Catch {
Add-content $LogFile "Error adding user to group - $($_.Name)"
}
}