Required Permissions - Veeam Backup Explorers Guide
helpcenter.veeam.com › docs › backupFeb 23, 2021 · If the In-Place Hold Items folder does not exist, the account being used must be able to create folders under the All Public Folders root node. Restore to a Mailbox. If the account owns a mailbox, make sure it has Full Access. If the account does not own a mailbox, then access must be granted through impersonation. See Granting Full Access.
KB2969: Veeam Backup for Office 365 Complete Permissions
https://www.veeam.com/kb296926.06.2019 · 2969. Product: Veeam Backup for Microsoft Office 365 5.0, Veeam Backup for Microsoft Office 365 4.0. Published: 2019-06-26. Last Modified: 2021-08-12. Starting with Veeam Backup for Microsoft Office version 4c, two different modern authentication methods and a basic authentication method for working with Office 365 organizations are supported.