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BugZero found this defect 1299 days ago.
You are adding a Microsoft Azure account to Veeam Backup & Replication. You need to select the method of importing your Azure Resource Manager subscription, and you want to use an existing Azure Active Directory Account. Also, you have more than one Azure Active Directory tenant associated with your account. In this case, you will need to specify which tenant to use.
Create the following registry value, replacing <AAD-Tenant ID> with the appropriate GUID. Key Location: HKLM\SOFTWARE\Veeam\Veeam Backup and ReplicationValue Name: AzureDefaultTenantIdGUIDValue Type: REG_SZValue Data: <AAD-Tenant ID>