Connect-SPOService -Url https://tenant-admin.sharepoint.com
Get-SPOExternalUser -SiteUrl https://tenant.sharepoint.com/sites/sitename -PageSize 50 -Position 0
Get-SPOUser -Site https://tenant.sharepoint.com/sites/sitename
Create a report of SharePoint Online External Users with PowerShell
Bug in Get-SPOExternalUser PowerShell : Not all external users are returned
List all external users on all SharePoint sites with PowerShell
Retirer un utilisateur de la liste SharePoint
Utilisateurs orphelins
Accorder l’accès d’administrateur de collection de sites