See the explanation below.
Explanation
1. In the Azure portal, type Key Vaults in the search box, select Key Vaults from the search results then select KeyVault11641655. Alternatively, browse to Key Vaults in the left navigation pane.
2. In the Key Vault properties, scroll down to the Settings section and select Access Policies.
3. Select the Azure Disk Encryption for volume encryption

4. Click Save to save the changes.

Explanation

Box 1: DeployIfNotExists
DeployIfNotExists executes a template deployment when the condition is met.
Box 2: Template
The details property of the DeployIfNotExists effects has all the subproperties that define the related resources to match and the template deployment to execute.
Deployment [required]
This property should include the full template deployment as it would be passed to the Microsoft.Resources/deployment References:
https://docs.microsoft.com/en-us/azure/governance/policy/concepts/effects

Explanation
When you transfer billing ownership of your subscription to an account in another Azure AD tenant, you can move the subscription to the new account's tenant. If you do so, all users, groups, or service principals who had role based access (RBAC) to manage subscriptions and its resources lose their access. Only the user in the new account who accepts your transfer request will have access to manage the resources.
Reference:
https://docs.microsoft.com/en-us/azure/billing/billing-subscription-transfer
https://docs.microsoft.com/en-us/azure/billing/billing-subscription-transfer#transferring-subscription-to-anaccou