PowerShell to Get All Sites Associated with the Hub Sites in SharePoint Online

#Import SharePoint Online PowerShell Module
Import-Module Microsoft.Online.SharePoint.Powershell -DisableNameChecking

#Variables
$AdminCenterURL = "https://crescent-admin.sharepoint.com"
 
#Connect to SharePoint Online
Connect-SPOService -Url $AdminCenterURL -Credential (Get-Credential)

#Get all Hubsites
$HubSites = Get-SPOHubSite

#Get all site collections
$Sites = Get-SPOSite -Limit All  

#Iterate through site collections to get associated sites with the hub
ForEach($Hub in $HubSites)
{
    Write-host "Hub-Site:"$Hub.SiteUrl
    #Get the ID of the Hubsite
    $HubSiteId = $Hub.ID.GUID

    #Iterate through each site collection
    ForEach($Site in $Sites)
    {
        #get the Associated Hubsite ID
        $AssociatedHubSiteID = (Get-SPOSite $site.Url).HubSiteID.GUID

        If($AssociatedHubSiteID -eq $HubSiteId)
        {
            Write-Host "`t $($Site.Url)"
        }
    }
}

#Import SharePoint Online PowerShell Module
Import-Module Microsoft.Online.SharePoint.Powershell -DisableNameChecking

#Variables
$AdminCenterURL = "https://crescent-admin.sharepoint.com"
$HubSiteURL = "https://crescent.sharepoint.com/sites/intranet"
 
#Connect to SharePoint Online
Connect-SPOService -Url $AdminCenterURL -Credential (Get-Credential)

#Get the Hubsite ID
$HubSiteId = (Get-SPOHubSite | Where {$_.SiteUrl -eq $HubSiteURL}).Id.Guid

#Get all site collections
$Sites = Get-SPOSite -Limit All  

#Iterate through site collections to get associated sites with the hub
ForEach($Site in $Sites)
{
    Try {
        #Get the Associated Hubsite ID of the site collection
        $AssociatedHubSiteID = (Get-SPOSite $site.Url).HubSiteID.GUID

        If($AssociatedHubSiteID -eq $HubSiteId)
        {
            Write-Host "`t $($Site.Url)"
        }
    }
    Catch {
        write-host -f Red "`tError:" $_.Exception.Message
    }
}

#Variables
$AdminCenterURL = "https://crescent-admin.sharepoint.com"
$HubSiteURL = "https://crescent.sharepoint.com/sites/intranet"

#Connect to Pnp Online
Connect-PnPOnline -Url $AdminCenterURL  -Credentials (Get-Credential) #-Interactive

#Get the hub site id
$HubSiteID = (Get-PnPTenantSite $HubSiteURL).HubSiteId

#Get all site collections associated with the hub site
Get-PnPTenantSite -Detailed | select url | ForEach-Object { 
  $Site = Get-PnPTenantSite $_.url 
  If($Site.HubSiteId -eq $HubSiteId){
    write-host $Site.url
  }
}

#Variables
$AdminCenterURL = "https://crescent-admin.sharepoint.com"
$HubSiteURL = "https://crescent.sharepoint.com/sites/intranet"

#Connect to Pnp Online
Connect-PnPOnline -Url $AdminCenterURL  -Credentials (Get-Credential) #-Interactive

#Get the hub site id
$HubSiteID = (Get-PnPTenantSite $HubSiteURL).HubSiteId

#Loop through site collections
$Sites  = Get-PnPTenantSite
ForEach($Site in $Sites)
{
    #Get the Site collection
    $Site = Get-PnPTenantSite $Site.url -ErrorAction SilentlyContinue
    If($Site)
    { 
        If($Site.HubSiteId -eq $HubSiteId)
        {
            write-host "Setting Site Collection to Read-only:"$Site.url
            Set-PnPTenantSite -Url $Site.URL -LockState ReadOnly
        }
    }
}