We are currently investigating an uptick in errors backing up Exchange Online mailboxes with the message “The HTTP request was forbidden with client authentication scheme ‘Anonymous’" with Microsoft. We will share additional information once we are able. More specific information is at https://www.veeam.com/kb4796.

As of March 25, we have deployed an update globally and are seeing stable operation. 

While no new instances of the error are being observed, we are continuing follow-up work to ensure all previously impacted scenarios are fully resolved. An update on this work will be provided as soon as possible.

Maintenance has started

Maintenance has started