The commands should provide you the ILB IP mapped to this domain if the DNS records are configured properly. If not, then you would need to update the DNS Configuration accordingly. You can refer this document for DNS Configuration.
2. You can execute below commands to check the connectivity to the apps in ILB ASE:
curl -v <AppName>.<ASEName>.appserviceenvironment.net net -k
Execute this command from the VM / Machine which is in the Virtual Network or Connected network.