If you need to get SharePoint security group details for all the SharePoint online site collections then you might to use a 3rd party tool to generate that report for you. This could also be possible by going through all the sites or using PowerShell.

I am sharing a simple PowerShell where you can share the list of all site collections in a csv file and script will loop through all the site collections and will list you all the site security groups used in that site collection.

$TenantUrl = "https://<site URL>-admin.sharepoint.us"
$CSVPath = "D:\Migratedsites.csv"

Connect-SPOService -Url $TenantUrl

$SiteCollections = Import-Csv -Path $CSVPath
 
    #Loop through csv and create site collections from each row
    ForEach ($Site in $SiteCollections)
    {
        $siteUrl = $Site.URL
        Write-host "Creating Site Collection:" $siteUrl -f Yellow
        $group = Get-SPOSiteGroup -site $siteUrl | Select Title, Roles, Users  | Where-Object {$_.Roles -eq "Edit"}
        
  } 

Now you can use this script for multiple purpose, can add user to and of the security group, or can fetching the member details for any of these security groups. You can add below cmdline to add a user to the group:

Add-SPOUser -Site $siteUrl -Group $group.Title -LoginName $UserAccount

You can also filter the groups by role by adding a filter to the Get-SPOSiteGroup function:

  Get-SPOSiteGroup -site $siteUrl | Select Title, Roles, Users  | Where-Object {$_.Roles -eq "Edit"}

Adnan, a distinguished professional, boasts an impressive track record as a Microsoft MVP, having achieved this prestigious recognition for the eighth consecutive year since 2015. With an extensive career spanning over 18 years, Adnan has honed his expertise in various domains, notably excelling in SharePoint, Microsoft 365, Microsoft Teams, the .Net Platform, and Microsoft BI. Presently, he holds the esteemed position of Senior Microsoft Consultant at Olive + Goose. Notably, Adnan served as the MCT Regional Lead for the Pakistan Chapter from 2012 to 2017, showcasing his leadership and commitment to fostering growth within the tech community. His journey in the realm of SharePoint spans 14 years, during which he has undertaken diverse projects involving both intranet and internet solutions for both private and government sectors. His impact has transcended geographical boundaries, leaving a mark on projects in the United States and the Gulf region, often collaborating with Fortune 500 companies. Beyond his roles, Adnan is a dedicated educator, sharing his insights and knowledge as a trainer. He also passionately advocates for technology, frequently engaging with the community through speaking engagements in various forums. His multifaceted contributions exemplify his dedication to the tech field and his role in driving its evolution.

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