AWS has machine types that require ENA Support. You can run AWS CLI to find out if instance is ENA enabled.
aws ec2 describe-instances \
--instance-id i-xxxxxxxxxxxxxxxxx \
--profile default \
--region us-east-1 \
--query 'Reservations[].Instances[].EnaSupport'
Login to the instance and verify.
sudo lspci | grep -i Amazon
List driver details.
modinfo nvme
Verify modules loaded at startup.
lsmod | grep nvme
lsmod | grep ena
If ENA drivers are missing, install them.
yum install pciutils