Because a backup of a physical machine cannot go directly to instant recovery, different steps are necessary from the way you would restore a virtual machine.

Note: If this is a test as opposed to a live server down situation, we recommend disabling the backup copy job associated with the machine being restored.

1. To begin, click Restore => Agent on the top ribbon.

2. Choose Entire machine restore 

and then choose Instant Recovery to Microsoft Hyper-V:

 3. In the Restore Session window, click Close.

4. Under Recovery Tools, click Instant Recovery.

Right click the VM.

Click Migrate to production….

This will begin the process of migrating the VM from an instant restore to a permanent VM.

See this KB from Veeam for more information: https://helpcenter.veeam.com/docs/backup/vsphere/instant_recovery.html?ver=100

Note: If you do not wish to keep the VM and it has not been converted to a permanent state, click Stop publishing.