Minecraft xbox connection issues?

So me and my friends really want to do something, & I agree to do something on minecraft. But even if I'm invited by someone other than the host, I can't connect to the game. We both have reset our Xboxes, but it's just not working. What do I do? Like, I like to keep things simple. Cuz I'm not even really the smartest person so. I'm desperate for answers, all answers are totally acceptable.

The most common problem with this is that minecraft needs you xbox to be connected to an HDTV with an hdmi cord to play multiplayer, so if one of you does not have this it will not work.