I play on Minecraft: Windows 10 Edition, and since I updated to the new 1.12 version my friends get a simple (can't connect to world) message. However, I can join anyone's game.
I have already tried uninstalling and reinstalling, hard resetting my Xbox and router and I have checked my NAT type which is Open. If anyone has a solution, please let me know.
Best Answer
Be sure your default spawnpoint is not obstructed. If you want, try and place it again. You will need to enable commands for this.
I had the same problem with my friends, and that was because I had being playing in the Nether.
Be sure to have your spawnpoint and the world's spawnpoint both in the overworld (
spawnpointfor the player andsetworldspawnfor the world, both set the spawn where you cast them). I also made sure to stay in the overwold while they entered for the first time, but that shouldn't be necessary.