I have used the Back To My Mac feature in macOS a few times over the years, but not recently. An FYI for you, Apple has removed Back To My Mac from Mojave. It will be no more. If you need to do Screen Sharing with other Macs, this article describes ways to do that, not to worry. For me, I have been using the Screens App from Edovia. It costs a couple of bucks but works great as described in one of my blogs.