Veeam Backup for Microsoft 365 “Failed to find Team mailbox owner account”
The “Failed to find Team mailbox owner account” error can be caused by the owner of the mailbox being moved, or if the owner no longer has a licensed assigned. Resolving either of these will also resolve your M365 issues. Here are the steps to resolving the cause to either issue: If the owner was removed from the mailbox: Assigned owner does not have a license: As these are two of the most common causes of the “Failed to find Team mailbox owner account” error, there may be other issues causing the error. If your issues persist, please reach out to Support@Managecast.com for assistance. Additional Microsoft information on assigning a Team mailbox owner can be found HERE, and assigning a license can be found HERE.
