A VM is not reachable under its new IPv4 address if it is attached after VM creation
Issue: IPv4 addresses are only automatically added to the VM during the creation-request. Once a VM is running, automatic attachment is not possible anymore.
Workaround: You may manually update the internal configuration to use the newly attached IP address. We will shortly add a support article for this. In the meantime, please reach out to support, or create a new VM.