IPV4 and IPV6 Open NAT

IPV4 and IPV6 Open NAT
So I recently got the BGW210 700 model modem from ATnT for uverse as a replacement since my ISP upgraded my services to 18 speed. I started playing World of Warships Legends no issues with connection, or what so ever. When I checked my NAT it was at moderate,
I tested my NAT to see if it opens after 2 tries it set to Open. However, when I try jumping back into WOWS legends it took a while for it to connect and prompt this error message "Failed to connect to server, please try again later" I didn't know what was
causing the issue when I first installed the modem.

I checked my xbox IP, my gateway, subnet etc on the IPV4 I have em at manual, but they were grey'd out except the gateway and the IPV6 IP address both are highlighted. I reset my modem and I was able to play WOWS again, no issues again. I open my nat again
while in game, no connection issue until it started to lag me while playing I quit the game to juml to another server, but the message prompt the same thing "Failed to connect to server, please try again later". I was getting frustrated trying to figure out
why it was problem looking online finding a solution but nothing.

I went into my modem's IP to check the firewall and NAT, I was thrown off how different the UI is since I'm used to the other one.

when I try to put my xbox IP to open the nat again but the way to put the IP was based on the IPV6 set up to open nat. I was confused how it was (Used to the Ipv4 set up). I looked online on how to set it open, researching the model of modem and learning
the difference between IPV4 and IPV6. Understood the IPV6 net opens the NAT by itself since its not limited because of it's new features it has with the IP address. I left it at moderate to play wows. While I was playing, my brain started to run with questions
'Why is this a problem?' Why is it when I test my nat to open, it doesn't let me connect to wows, but it connects with other games?' 'Why is the UI of my modem different from the other one to set IPs with its digit numbers?'

Then it hit me, I checked the connection settings on my xbox and went into my modem, firewall, nat and saw the they way its set up I look at the IPV6 IP address which now I assume it must be my new xbox Ip. I also assumed since I have the nat open on my
IPV4 and this is a new address IPV6 it may be the cause of the problem for the connection to get on wows.

Now here are my questions. Do I have to erase my xbox IPV4 ip address for it not to cause a collision with the IPV6 or do I have to set up an new IP address with the IPV6 xbox address to open the Nat again?

:)