Limits

Dedicated servers are out. Use the world you opened from the title screen, or open it to LAN.

The world has to stay loaded. If you quit to menu, gifts queue in TikFinity and nothing happens in Minecraft.

Commands run on the integrated server thread. A command that locks the server locks your game.

If TikFinity cannot connect: world open, cheats on, port 4567 (or whatever you set), name spelled the same in both places. Windows firewall likes to eat 4567 the first time.