Example of using the Microsoft.Graph PowerShell module to read basic metadata about all unified groups and dump results to csv.

Export-UnifiedGroupMetadataToCsv.ps1

#requires -modules "Microsoft.Graph.Authentication", "Microsoft.Graph.Groups", "Microsoft.Graph.Files"

<#
    App Principal Permissions Required, must have any one permission for each of the three cmdlets.
    
    Get-MgGroup      == GroupMember.Read.All, Group.Read.All, Directory.Read.All, Group.ReadWrite.All, Directory.ReadWrite.All
    Get-MgGroupOwner == GroupMember.Read.All, Group.Read.All, GroupMember.ReadWrite.All, Group.ReadWrite.All, Directory.Read.All
    Get-MgGroupDrive == Files.Read.All, Files.ReadWrite.All, Sites.Read.All, Sites.ReadWrite.All
#>

# connect to graph
Connect-MgGraph `
    -ClientId              $env:O365_CLIENTID `
    -CertificateThumbprint $env:O365_THUMBPRINT `
    -TenantId              $env:O365_TENANTID | Out-Null

Select-MgProfile -Name beta # required for Get-MgGroupEndpoint

# query for all unified groups
$unifiedGroups = Get-MgGroup -Filter "groupTypes/any(a:a eq 'unified')" -Property Id, DisplayName, CreatedDate, Mail, Visibility, CreatedDateTime, resourceProvisioningOptions -ExpandProperty Owners -PageSize 999 -All

$timestamp = Get-Date -Format FileDateTime

$counter = 1

# enumerate unified groups
foreach( $unifiedGroup in $unifiedGroups )
{
    Write-Host "$(Get-Date) - Processing $($counter.ToString("D4")) of $($unifiedGroups.Count) groups"

    $owners = $unifiedGroup.Owners.AdditionalProperties.userPrincipalName -join ","
    
    # pull the drive information
    $drive = Get-MgGroupDrive -GroupId $unifiedGroup.Id -Property SharePointIds | Select-Object -First 1

    # pull endpoints
    $groupEndpoints = Get-MgGroupEndpoint -GroupId $unifiedGroup.Id

    $group = [PSCustomObject] @{
                GroupId         = $unifiedGroup.Id
                GroupName       = $unifiedGroup.DisplayName
                CreatedDateTime = $unifiedGroup.CreatedDateTime
                Mail            = $unifiedGroup.Mail
                Visibility      = $unifiedGroup.Visibility
                TeamsConnected  = $unifiedGroup.AdditionalProperties.resourceProvisioningOptions -contains "Team"
                YammerConnected = ($groupEndpoints | Where-Object -Property "ProviderName" -eq "Yammer") -ne $NULL 
                WebUrl          = $drive.SharePointIds.SiteUrl
                Owners          = $owners 
             }

    $group  | Export-Csv -Path "C:\_temp\UnifiedGroupInformation_$timestamp.csv" -NoTypeInformation -Append

    $counter++
}

If you are using newer version of the MSGraph SDK, skip the Select-MgProfile -Name beta line, and instead install the module Microsoft.Graph.Beta.