Retirement of cloud archive mailbox access by using Exchange Server on-premises OWA | Microsoft Community Hub Announcing retirement of OWA access to online archives for on-premises mailboxes.  

On-premises OWA access to cloud archive mailbox is being retired. Note that this affects only OWA and does not affect Outlook.

techcommunity.microsoft.com/blog/exchang...

#MSExchange #Announcement #CloudArchive #OWA