Cross platform full access permissions

A small number of accounts have been migrated to Exchange Online prematurely, impacting delegate permissions. Some on-premise users may temporarily be unable to access their colleagues mailbox through full access delegate permissions in Outlook (visit this article for a temporary OWA solution). The impacted accounts will be rolled back to Exchange on-premise and permissions restored by 14/11. The rolled back users will be re-migrated to Exchange Online over the coming weeks once all users have been successfully transferred.