KB2969: Veeam Backup for Office 365 Complete Permissions
https://www.veeam.com/kb296926.06.2019 · Veeam service account permissions Veeam service account you are going to use should have a Global Administrator role. Azure AD Application Permissions There are two options: Have Veeam Backup for Office 365 automatically create the Azure AD application and all the required application permissions will be granted automatically. or