Why cannot we use Back recovery vault created in one resource group to attach to the resources in other Resource group?

my question is that if we have a recovery vault created in one resource group, Is there a way in terraform to use same recovery vault across different resource groups with different resources?

What i am trying to acheive is that i have a backup vault created in one resource group and backup policy attached to the vault.

Now , i have to use that vault in another resource group to Windows VM resource.
Which i am not able to do with Terraform.