Fail to register another vault for a Hyper-V server

Scenario

The previous Site Recovery vault was deleted form the Azure and the Hyper-V was uninstalled the Azure Site Recovery Provider. When you register a Hyper-V server with an Azure Site Recovery vault, you get the following error message.

The server is already registered in vault. Either select the registration key associated with this vault, or unregister the server from and then register it with a different vault. Learn more on how to unregister the server from the previous vault: http://aka.ms/unregisterservers.

Cause

The previous Azure Site Recovery Vault is still remained in the registry of the Hyper-V Server

Solution

1. Cancel the installation.

2. Launch Registry Editor and navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Azure Site Recovery.

3. Delete the Azure Site Recovery key.

4. Uninstall and reinstall the provider and agent setup.

Reference:

Vault registration fails with "already registered" error in Azure Site Recovery

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