I was creating a Minecraft mini-game on my Nintendo switch Minecraft bedrock because that's the version I play the most. But every time my friends try to join my world it says they are unable to connect to world. My friends are Xbox and PlayStation players so I thought it was probably a cross-play issue:

But when I join their world it allows me very easily so I thought it must be a problem with the Nintendo Switch:

But I thought that to be un-likely so I tried joining my brother's world as a test since he is on PlayStation 4, but just like my friends, it said unable to connect to world. I tried this multiple times and it never worked, even when he tried to join my worlds. But we can both join our friends' worlds.

So, as one final test, I told my friends to try and join both my and my brother's worlds and again it was the same thing for both of us, unable to connect to world. So now I am thinking that it has something to do with my internet or Network settings but I have no idea how I could possibly fix that.