People can't join my custom game

I have a specific issue where NOT ONLY do people lack the ability to join my custom map, but whenever I invite friends to it, they are allowed in the lobby for about a second or two, but then get kicked. I gave the map file to a friend of mine who invited everyone, and it worked perfectly; everyone downloaded the map and joined the lobby without a problem. What could the issue be?

Edit: This is also not map specific, it’s specific to my account for some reason. I got other people to join for roughly a half second for other custom games that I know run fine, but they also got booted about a second or two in.