Cloud DNS can no longer be created after I repeated, several times, Installing WordPress on the Google Cloud and Removing the Project.
A warning similar to the following appears.
The domain "mydomainatgoogledomain.com." (or its child domains) may be reserved or registered already, prohibited by policy, or there may be no DNS name server shards remaining for the name. For more information see https://cloud.google.com/dns/quotas#nameserver_limits.
Currently, only one Google wp installed project exists on my google cloud.