Note: This issue will be resolved in the next release of Veeam Backup & Replication.
To resolve this issue in Veeam Backup & Replication versions 11/11a/12, create the following registry value on the Veeam Backup Server:
Key Location: HKLM\SOFTWARE\Veeam\Veeam Backup and Replication
Value Name: AmazonDefaultWindowsImage
Value Type: Multi-String Value (REG_MULTI_SZ)
Value Data: <see code block below>
Tip: Hover over the code block and click the copy button in the top-right corner.