1. Verify that the Agent Identity exists and is of type `agentIdentity`.
2. Construct the request body with the required properties for the Agent User.
3. Send a POST request to the Microsoft Graph API endpoint `/beta/users/microsoft.graph.agentUser` to create the Agent User.
4. (Optional) Assign a manager to the Agent User using a PUT request to `/beta/users/{agent-user-id}/manager/$ref`.
5. (Optional) Set the usage location for the Agent User using a PATCH request to `/beta/users/{agent-user-id}`.
6. (Optional) Assign a license to the Agent User using a POST request to `/beta/users/{agent-user-id}/assignLicense`.
7. Verify the successful creation and configuration of the Agent User.