Microsoft recently (Apr 2024) announced general availability for it’s new SharePoint Archive feature (learn more). So if you are seeing “The site is archived” and “A SharePoint Administrator archived this site. If you need access, ask an admin to reactivate it.” error message and the page in your browser is “sharepointerror.aspx?scenario=SiteArchived” then… guess what… your site was archived.

And if you need this site – please reach your SharePoint admin as soon as possible, as reactivating the site within 7 days is free, otherwise it might cost your company some dollars.

Though the page Url is “https://yourtenant.sharepoint.com/_layouts/15/sharepointerror.aspx?scenario=SiteArchived” and the page title is “Error”:

this is not an error but just a new SharePoint feature 🙂