How to create O365 Groups in Powershell from a csv file

Hello,

First I want to say that it's my irst post here, so I didn't know if I should post here or in the Powershell conversations.

I'm struggling at the moment because I'm trying to massively create a few hundreds Office 365 groups for my organization, each with (possibly) multiple owners and members.

I've got a list of the groups to create in a csv file, which looks like that:

Name;Email;Members;Owners
O365 Test Group Vincent;O365_TestGroup_vincent@xxx.fr;e-mail_of_member1, e-mail_of_member2;e-mail_of_owner1, e-mail_of_owner2
(of course in my actual script I have the actual e-mail addresses)

My script looks like that:

$Groups=Import-Csv "path to my csv file" -Header Name, Email, Members, Owners -Delimiter ";" | select -skip 1

foreach ($Group in $Groups){
$Name=$Group.Name
$Mail=$Group.Email
$Members=$Group.Members
$Owner=$Group.Owners
New-UnifiedGroup -DisplayName $Name -EmailAddresses $Mail -ManagedBy $Owner -Members $Members -AccessType Private -Language fr-FR -RequireSenderAuthenticationEnabled $false -SubscriptionEnabled -AutoSubscribeNewMembers
}

It seems that adding multiple members or owners in a variable from a text file does not work like that.

It returns me this error (in French, but it says that "user1, user2" cannot be found)

Désolé... Nous n’avons pas pu trouver le propriétaire «e-mail_of_owner1, e-mail_of_owner2», car nous avons rencontré l’erreur «L'objet
"user1, user2" est introuvable. Assurez-vous que vous l'avez correctement tapé ou spécifiez un autre objet.».
+ CategoryInfo : NotSpecified: (:) [New-UnifiedGroup], GroupMailboxFai...eOwnerException
+ FullyQualifiedErrorId : [Server=MR2P264MB0033,RequestId=036653cc-558d-407c-9e71-84ce2c437b53,TimeStamp=26/10/2018 12:12:42] [FailureCategory=Cmdlet-GroupMailboxFailedToResolveOwnerException] 4C7DBAFB,Microsoft.Exchang
e.Management.RecipientTasks.NewUnifiedGroup
+ PSComputerName : ps.outlook.com

If I try without the import-csv part and I put multiple owners separated by a comma in my variable, it works, I can create one group like that (but that means 1 script for 1 group)

So I don't really know how to do it with my list of groups in a text file.

Can you help me with that please?

Thanks in advance.

Best regards,

Vincent