Minecraft: Bedrock Edition on Xbox.

Getting "Unable to connect to world" error when trying to join a friend's world.

I am allowed to join my friend's world, they are unable to join mine.

Below will be noted all the things we've tried doing to fix this problem. None worked.

Restarting Xbox console.

Restarting internet router.

Reinstalling Minecraft.

Removing the specified friend and re adding the player.

Turning multiplayer off, then turning it back on in world settings.

Made sure that privacy & online safety setting did not block multiplayer play.

Making sure that NAt type is displaying "Open".

Checking NAT type.

Blocking Multiplayer play, then unblocking it in Xbox settings.

Setting console to offline, then reconnecting to internet.

Making sure both games have been updated to latest version.