Hello, I am the author of the above-mentioned tutorial. Larson is correct that the URL to reach Access Anywhere on a Windows Server 2016 Essentials should be https://remote.domain.com/remote. Anything else does not work.
It is interesting to see on this board that there is a discussion going on for refreshing the certificate on RDS and restarting the service, see Post-renewal script for binding new certificate to Remote Desktop Gateway. This is definitely needed on a Windows Server 2016 Essentials but hopefully v4 is released that has this included if I understand it correctly