But you’re most recently trying to get a certificate for me-n-you.com, not mail.me-n-you.com. The name me-n-you.com points to a different server, 54.245.151.14, which is presumably a different AWS instance.
In order to get a certificate for me-n-you.com, you should run Certbot on the 54.245.151.14 instance. In order to get a certificate for mail.me-n-you.com, you should run Certbot on the 34.209.16.38 instance. In each case, you would specify the name that the certificate should apply to with the -d option.