v2.3 > v3.0 Upgrade issues

[jared-stoker]

Hoping for some help here. I recently took over responsibility for an etcd cluster. I have 3 nodes on conventional ec2 instances. Everything is running great. All 3 nodes are healthy. When trying to migrate to v3.0 I created a new json configuration file and when trying to start the instance I can't seem to get past the error that etcdmain cannot listen on TLS: KeyFile and CertFile are not presented.

I did follow the correct structure for referencing the cert files -
client-transport-security:
cert-file: '/opt/etcd-v3.0.0-linux-amd64/certs/etcd00-use1.cer'
key-file: '/opt/etcd-v3.0.0-linux-amd64/certs/etcd00-use1.key'
peer-transport-security:
peer-cert-file: '/opt/etcd-v3.0.0-linux-amd64/certs/etcd00-use1.cer'
peer-key-file: '/opt/etcd-v3.0.0-linux-amd64/certs/etcd00-use1.key'

And I get no issues on v2.3 using the certs. Some of the upgrade documentation is inconclusive and searching for help on other forums has come up short. Any help would be greatly appreciated!