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AMIs don't have ENA enabled #1853
referenced this issue
Mar 7, 2017
This might not be as trivial as it seems since, iirc, the ancient ec2-utils package we're using doesn't have the flag we need. It didn't the last time I glanced at this.
Changing it to use the aws cli (or getting plume in shape) does fix the problem, but isn't quite so trivial.
Hopefully my memory is wrong or ec2-utils has been updated and does have the flag.