Step1: Connect MSOL Services
Connect-MsolService
Step2: Find out ObjectID of the Security Group you would like add members to
Get-MsolGroup –Maxresults 100000 | Where-Object {$_.DisplayName -eq “Test Security Group”}
Get-MsolGroup –ObjectId “af407072-7ae1-4b07-a0ca-6634b7396054”
OR
Sign-in to Portal.Azure.Com and Select Azure Active Directory>Security Groups>Search the Group>Go to properties of the group and copy the ObjectID
Step3: Create a CSV file with a header UserPrincipalName and list all email addresses in one column of CSV file e.g.
UserprincipalName
Step4: Execute the PowerShell Script to add users into the Security group
Copy the script and paste it in a notepad. Rename the notepad to Add-MsolGroupMembers.PS1
Import-CSv -Path “c:\Temp\testscript.CSV” | ForEach {
$UPN=$_.UserPrincipalName
$Users=Get-MsolUser -UserPrincipalName $UPN
$Groupid = Get-MsolGroup -ObjectId “0c3c9f82-2392-43cc-bc00-b0d7b5734ac4”
$Users | ForEach {Add-MsolGroupMember -GroupObjectId $GroupID.ObjectID -GroupMemberObjectId $Users.ObjectID -GroupMemberType User}
}
Run the scripts
Blog by Raihan Al-Beruni 
Very nice.
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HI.
I have been trying to add member in a group in this way
$dcli = Get-MsolUser -All -DomainName “clinicaunisabana.edu.co” -Title “B”
$dcliid = Get-MsolGroup -All | Where-Object {$_.DisplayName -eq “Deshabilitados Clinica”}
$dcli | foreach {Add-MsolGroupMember -GroupObjectId $dcliid.ObjectId -GroupMemberObjectId $_.ObjectId -GroupMemberType User}
But the result have been:
Add-MsolGroupMember : You cannot update mail-enabled groups using this cmdlet. Use Exchange Online to perform this operation.
For me it have been impossible to do, please help me
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It appears that you are not adding members to MSolGroup. I have no visibility over your environment. You need to modify the script to suite your requirement.
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Hi Raihan, thank for you answer, but I don’t understand you, I have been doig this applying several solutions located in the web but the result is always the same.
I like explain you acroos the web meeting, is it possible?
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