Welcome to the forum! We're glad you decided to join.
So, you have an automatic ice maker that's not making ice... but I'm not sure what you mean by your empty water tank fills when you try to disconnect.
Is the issue that you're not getting water into the ice maker? Can you see it filling the cube slots? There are usually turn off valves for ice makers so make sure it's turned on and getting water to the freezer. I assume the freezer is getting cold enough to freeze water(?)
Maybe one of our experts will chime in soon but we're glad you're here!