Disallow access to SharePoint Online Site

Question

How can I temporarily prevent access to a SharePoint site collection in SharePoint Online without removing it or deleting the user permissions?

Answer 1

Lock access for SharePoint Online Site Collection.

In SharePoint Online, you can use the below PowerShell to lock access to a site collection without deleting it.

Set-SPOSite https://melqassas.sharepoint.com/sites/DemoSites -lockstate NoAccess

See also Prevent access to site collection SharePoint Server 2019