The next script allows to get the users from the SharePoint Online site collection / sites using PowerShell script. The SPO Management shell has API to get all the users from all the sites in the SharePoint online.
################################################################# # Script that allows to get all the users for all the Site Collections in a SharePoint Online Tenant # Required Parameters: # -> $sUserName: User Name to connect to the SharePoint Admin Center. # -> $sMessage: Message to show in the user credentials prompt. # -> $sSPOAdminCenterUrl: SharePoint Admin Center Url ################################################################## $host.Runspace.ThreadOptions = "ReuseThread" #Definition of the function that gets all the site collections information in a SharePoint Online tenant function Get-SPOUsersAllSiteCollections { param ($sUserName,$sMessage) try { Write-Host "----------------------------------------------------------------------------" -foregroundcolor Green Write-Host "Getting the information for all the site colletions in the Office 365 tenant" -foregroundcolor Green Write-Host "----------------------------------------------------------------------------" -foregroundcolor Green $msolcred = get-credential -UserName $sUserName -Message $sMessage Connect-SPOService -Url $sSPOAdminCenterUrl -Credential $msolcred $spoSites=Get-SPOSite | Select * foreach($spoSite in $spoSites) { Write-Host "Users for " $spoSite.Url -foregroundcolor Blue Get-SPOUser -Site $spoSite.Url Write-Host } Write-Host "Getting users" -ForegroundColor Green ##Get-SPOUser -Site "<SITECOLLECTION URL HERE>" | Out-File "C:UsersSenthamilDownloadsSharePoint OnlineUsers.txt" -Append; } catch [System.Exception] { write-host -f red $_.Exception.ToString() } } #Connection to Office 365 $sUserName="UID@domain.onmicrosoft.com" $sMessage="SPO Credential Please" $sSPOAdminCenterUrl="https://<DOMAIN>-admin.sharepoint.com/" Get-SPOUsersAllSiteCollections -sUserName $sUserName -sMessage $sMessage