Why do we need you to delegate DNS for mobile apps specifically

Why we need an Alias A record to support iOS and Android mobile apps:

The base domain for the Iotum whitelabel meet.domain.tld hosts files required for deep linking. Apple and Google, respectively, require that deep linking files at https://meet.domain.tld. Since we require a C Name of *.meet.domain.tld we need an A record for meet.domain.tld. However, this FQDN of meet.domain.tld is behind an AWS load balancer and the IP addresses are managed by AWS and those IP addresses can sometimes change. This requires that an Alias A record for meet.domain.tld exist that will automatically keep track of IP address changes to the AWS load balancer that allows the A record to point at a FQDN instead of an IP address. Route 53 supports these types of Alias A records. If your DNS does not support an Alias A record you will have to delegate your DNS to Iotum for meet.domain.tld.