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Hello.
"Edit IPv6 CIDRs" for a subnet cannot be selected unless an IPv6 CIDR is associated with the VPC.
Have you selected a VPC subnet with an IPv6 CIDR?
Please check the VPC ID carefully.
Thanks. I was in the middle of documenting that I HAD added IPv6 CIDRs to my VPC, and that my instance types DO support IPv6, when I decided to try again to assign IPv6 CDIRs to my subnets... and it allows it! Maybe it just took some time for AWS to process my IPv6 CIDR assignments to my VPC? If so that should be included in the docs so that we don't waste time trying to do something that doesn't work (yet?).
"Edit IPv6 CIDRs" will be enabled if your subnet's VPC has an associated IPv6 block. It will only be disabled if the VPC has no associated IPv6 block.
You MUST add IPv6 CIDRs to your VPC before editing subnet. And you need to check EC2 instances that support IPv6 or not. You can check it on web console of EC2 Instance Types tab and filtering by "IPv6 support : -".
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