Forward DNS and Reverse DNS are two completely different things.
No matter what you do in your DNS, it resolves depending on what the owner of this IP segment says.
Think of it as DNS in the opposite direction. let's say for foo.stackoverflow.com you first request the .com root domain for the NS stack stream, and then request that NS for foo A. say 192.168.1.1
But there is no way to make this jump in the opposite direction. nothing will lead you from 192.168.1.1 to NS for the stackoverflow.com domain. You need a completely different search, but now look at IP ranges instead of domains.
in the case of AWS, you need to fill out this form here: https://aws.amazon.com/forms/ec2-email-limit-rdns-request
They will modify it at their end to point to your A record, this is usually required for mail servers, so the request is for email restriction. just ignore this part and fill in the bottom of the form.
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