Add Users to Security Group in Exchange Online

I'm trying to add users from a csv file to a cloud-based Security group. I understand I need the Objectid of the SG. However I get 'access denied' when calling Get-Msolgroup -isAgentRole -UserprincipalName SG1@domain.com. I tried the steps mentioned in the following link:

https://community.office365.com/en-us/f/148/t/296477

My csv has only the UserPrincipalName column of users. Any thoughts?
Anthony K O365Asked:
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Vasil Michev (MVP)Commented:
The IsAgentRole parameter is only used when you are a partner, with the corresponding permissions. To get the ObjectId of a group, simply use:

Get-MsolGroup -SearchString "name of the group" | select DisplayName,ObjectId

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Anthony K O365Author Commented:
Excellent!
Anthony K O365Author Commented:
Vasil,

After running the PS all day, I get this error message:

Add-MsolGroupMember : You cannot update mail-enabled groups using this cmdlet. Use Exchange Online to perform this operation.

At C:\Users\AddMemberToSG.ps1:8 char:12
$sub2 | % {Add-MsolGroupMember -groupObjectid ‘xxxxx-xxxxxx-xxxxxxxx-xxxxxxx’ -GroupMemberObjectId $_.ObjectId -GroupMemberType User}

Any thoughts? Thank you!
Vasil Michev (MVP)Commented:
As noted in the error message, this cmdlet will only work against "regular" security groups. For mail-enabled security groups, use the Exchange remote PowerShell and Add-DistributionGroupMember
Anthony K O365Author Commented:
Excellent! This worked. I truly appreciate your help. True MVP
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