I've got a small matrix server. I don't want it to be federated, but I still want to make it easy enough for people I trust to join. When I generate an invite link for the room and try opening it in my client, it throws an error. The way I am currently doing it is having people register an account on the homeserver, then inviting them to the room by their username, but I feel like there has to be a better way. Can somebody who has experience running matrix servers help me out?