Ein Microsoft-Dienst für Dateihosting- und -synchronisierung
That message basically means the Microsoft link you opened can’t be shown because the item is no longer available or you don’t have access. The most common reasons are that the file/folder was deleted or moved, the sharing link expired, the link was created for “people in the organization” and you’re signed in with the wrong account, or the owner restricted access to specific people and your account isn’t included.
In most cases, the issue is on the sender/owner side (how the link was shared or the permissions set), not a problem with your account. Ask the sender to re-share the item, confirm the correct permissions, and send a new link.