Get All SharePoint Online Groups with “Full Control” Permissions using PowerShell

#Set Parameters
$AdminCenterURL="https://crescent-admin.sharepoint.com"
$SiteUrl = "https://crescent.sharepoint.com/sites/oncology"

#Connect to SharePoint Online
Connect-SPOService -Url $AdminCenterURL -credential (Get-Credential)

 #Get all Groups from the site
$SiteGroups = Get-SPOSiteGroup -Site $siteURL

#Get Group info that have "Full Control" Permissions
ForEach ($Group in $SiteGroups)
{
    If($Group.Roles.Contains("Full Control"))
    {
        Write-Host -f Yellow $Group.Title
        #Get each member of the group
        ForEach($User in $Group.Users | Where{$_.contains("@")}) #Exclude system Users
        {
            write-host -f Green $User
        }
    }
} 

#Variables
$AdminCenterURL = "https://crescent-admin.sharepoint.com/"
 
#Connect to SharePoint Online
Connect-SPOService -url $AdminCenterURL -Credential (Get-Credential)
 
#Get all Site collections
$Sites = Get-SPOSite -Limit All

#Loop through site collections
ForEach($Site in $Sites)
{
    Write-host -f Cyan "Searching site: $($Site.URL)"
    #Get all Groups from the site permissions
    $SiteGroups = Get-SPOSiteGroup -Site $Site | Where { $_.Roles -ne $NULL -and $_.Users -ne $NULL}

    #Get Group info and members that have site owners permissions
    ForEach ($Group in $SiteGroups)
    {
        If($Group.Roles.Contains("Full Control"))
        {
            Write-Host -f Yellow $Group.Title
            #Get each member of the group
            ForEach($User in $Group.Users | Where{$_.contains("@")}) #Exclude system Users
            {
                write-host -f Green $User
            }
        }
    }
}