Creating a DNS managedZone returns "INVALID_ARGUMENT"

Hi,

I am trying to create a managed DNS zone following the example [here](https://github.com/GoogleCloudPlatform/deploymentmanager-samples/blob/master/google/resource-snippets/dns-v1/managed-zone.yaml) and I get the following error in Deployment Manager:
```
ERROR: (gcloud.deployment-manager.deployments.update) Error in Operation [operation-1588969909552-5a528e3048557-8403a662-67474853]: errors:
- code: RESOURCE_ERROR
location: /deployments/dev-server/resources/YOUR_DEPLOYMENT_NAME
message: '{"ResourceType":"dns.v1.managedZone","ResourceErrorCode":"400","ResourceErrorMessage":{"code":400,"message":"Request
contains an invalid argument.","status":"INVALID_ARGUMENT","statusMessage":"Bad
Request","requestPath":"https://dns.googleapis.com/dns/v1/projects/mygcpproject/managedZones","httpMethod":"POST"}}'
```

Code:
```
resources:
- name: YOUR_DEPLOYMENT_NAME
type: gcp-types/dns-v1:managedZones
properties:
description: A managed zone
# Making dnsName unique with deployment name for testing purpose.
dnsName: my-great-domain-YOUR_DEPLOYMENT_NAME.com.
```

I also tried with `type: dns.v1.managedZone` as well as type: `gcp-types/dns-v1beta2:managedZones`. I get the same exact same error regardless of the properties that I add.

I can create the managed zone via the Console, gcloud command as well as pinging the REST API manually.

It's unclear why my Deployment Manager request is invalid, and what the INVALID_ARGUMENT is.

Any ideas?