Hardware provider is missing in Veeam Backup and Replication user interface

Backups using a specific hardware provider do not work, provider is missing from the user interface:

Veeam fails over to a software provider which does not have the functionality of a hardware provider (e.g. off-host proxy, fast snapshot creation, etc.)

On the Veeam Backup & Replication server, please create the following registry key:

HKLM\SOFTWARE\VeeaM\Veeam Backup and Replication UIShowAllVssProvidersForVolume
REG_DWORD
1

After creating the registry key, please restart the Veeam services and make sure that the required provider is visible and can be selected.

This value disables the advanced compatibility step which automatically chooses the best compatible providers.