libgdx ios app getting rejected for not working on IPv6 network using Ec2 and Kryonet

My App has now gotten rejected twice for not working on an IPv6 network on a device running IOS 10.2 My App was built using these resources and I was hoping someone could give me some insight on where to start looking.

Server:

• Amazon EC2 t2.micro
• IP address is IPv4 however the server says IPv6 is enabled
• All traffic is allowed in security groups
• Windows Server 2016

Libraries:

• LibGDX 1.9.5
• Kryo 2.23.1-SNAPSHOT
• Kryonet 2.18
• MobiDevelop's RoboVM fork 2.3.0

Please let me know which of these is most likely the culprit so I can proceed to fix it thank you!

I got this fixed. I was originally connecting to my servers by the IP address and have now switched it to the DNS. Works fine and made it through app review!