An Azure service that is used to manage and protect cryptographic keys and other secrets used by cloud apps and services.
Hello @ashlynn-youcount
I think Key Vault was selected to store secrets so that they can be used by VM during boot
Please refer to this link
If might have been selected during VM creation
Now, if you are facing the region error, then you can change the region of your VM as you can't change the region of your Key Vault, but during restore of the Key Vault did it asked for any region of choice or it restored to West US 2
To know how to change the VM's region, please refer this link