O365 Groups | Removing group membership in bulk for certain groups

jcasqueiro 

From ChatGPT 4o:

To remove all users from a list of Office 365 groups (specified in a CSV file) using PowerShell, you'll need to:

1. **Install the Microsoft Online module** to manage Office 365 groups.
2. **Connect to your Office 365 tenant** using your admin credentials.
3. **Process the CSV file** and remove the members from the groups listed in it.

Here’s an example PowerShell script to do this:

### Prerequisites:
- You should have the `AzureAD` or `Microsoft.Graph` module installed.
- You need admin access to the Office 365 tenant.

### CSV Format:
Your CSV file should contain a list of Group IDs or names in a column, say `GroupName` or `GroupID`.

```csv
GroupName
Group1
Group2
Group3
```

# Import the required module
Import-Module AzureAD

# Sign in to your Office 365 tenant
Connect-AzureAD

# Path to your CSV file
$csvPath = "C:\path\to\your\csvfile.csv"

# Import the CSV containing the list of groups
$groups = Import-Csv -Path $csvPath

# Iterate over each group in the CSV
foreach ($group in $groups) {
$groupName = $group.GroupName # Assuming the column is named GroupName

# Get the Group ID by Group Name
$o365Group = Get-AzureADGroup -SearchString $groupName

if ($o365Group) {
Write-Host "Processing group: $groupName"

# Get all members of the group
$members = Get-AzureADGroupMember -ObjectId $o365Group.ObjectId

foreach ($member in $members) {
# Remove each member from the group
Remove-AzureADGroupMember -ObjectId $o365Group.ObjectId -MemberId $member.ObjectId
Write-Host "Removed member: $($member.UserPrincipalName) from group: $groupName"
}
} else {
Write-Host "Group $groupName not found"
}
}

# Disconnect from Azure AD
Disconnect-AzureAD

### Explanation:
1. **Connect-AzureAD**: Establishes a connection to your Office 365 tenant.
2. **Import-Csv**: Loads the CSV containing the list of group names.
3. **Get-AzureADGroup**: Retrieves the Office 365 group based on the name in the CSV.
4. **Get-AzureADGroupMember**: Retrieves all members of the group.
5. **Remove-AzureADGroupMember**: Removes each member from the group.
6. **Disconnect-AzureAD**: Closes the session after processing.

Make sure to update the `$csvPath` variable to the correct path of your CSV file.

### Microsoft Graph Alternative:
If you are using Microsoft Graph, the steps would be similar, but you will use `Microsoft.Graph` module cmdlets instead. Let me know if you need a script for that too!