There is in fact weird cool off times for these cloud resources. I’m less familiar with AWS, but I know in azure once you delete/release one of these subdomains

There is in fact weird cool off times for these cloud resources. I’m less familiar with AWS, but I know in azure once you delete/release one of these subdomains, it remains tied to your organization/tenant for 60 or 90 days. You can reclaim it during that time, but any other tenant/organization will get an error that the name is in use. You can ping support to help you there if you show them you own both organizations. I was doing a migration of some resources across organizations and ran into that issue