I tried to play with one of my friends it doesn't work. I've tried taking down all the firewall stuff and so has my friend. We're both logged in. We can both play with other friends just fine. We've tried clearing the wifi and redownloading Minecraft. We've tried logging in and out. We've tried unfriending each other and adding each other back. None of it worked. It continues to say 'Unable to connect to world'.
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If you're able to connect to others'and just not that friend's or your own, that's clearly an issue on your guys' part, not an issue with the game.
Some suggestions)
1) if you're on the same network, ensure wmm is disabled, as this may interfere with local device communication.
2) some internet providers will disable certain ports, or prevent unsolicited incoming connections
3) try having other friends connect to yours or your friends' session, to see if they're unable to join as well.
4) if you're ina multi-layer network (a modem plus a router, or 2+ routers connected to one another) this may interfere as well - ensure that there are as few layers as possible.
While I'm not a mod or helper and you don't have to listen to me, I do hope that you'll consider this.

Thank you for your report!
We're tracking this issue in MCPE-36190, so this ticket is being resolved and linked as a duplicate.
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