I have just been pairing 4 Aqara Weather Sensors. With the first one I tried 2 or 3 times without the pairing completing (device found, initializing, then nothing). After a bit of research I found that I had to keep these devices awake (by button pushing) in order for the pairing to complete.
Now the zigbee graph shows all 4 connected and 2 unknown devices - which I guess came from the failed pairing attempts.
How can I get rid of them, or is it just a question of waiting?
Does the unkown devices show up in your zigbee list or just on the graph?
If it is showing up on the list then click on them and go through the remove process.
If it is not on the zigbee list and just the graph then there really is no good way to remove them. Sometimes they will go away on their own if showing connected directly to the hub. If they are showing connected through a repeater it is in the repeaters data. Again there is no real good way to remove these. I had 5 unknown devices on my graph for several months. They showed through repeaters. They did not go away until I updated the repeaters firmware and they went away at that point.
Good news is zigbee unlike Z-Wave will really not experience problems due to unknown devices on the mesh as long as they are showing as end devices.
Honestly if they are not causing your mesh any problems I wouldn't worry about them.
They are only in the graph, not in the list. And they are both linked to a zigbee socket, not directly to the hub.
Do you think that I can do something to the socket to make them disappear? Like unplug it or reset and pair it again with the hub?
If no other solution is suggested, I guess I will try to remove the successfully paired device in the hope that the 2 Unknowns will be removed at the same time. But I fear that this will not work.
You can try those but the unplugging it won't really reset the internal data tables of the socket so I can't guarantee if it works or not. It won't hurt anything to try those methods. The reset and repair might work. It might reset the data table.
I saw where you said remove the socket. I honestly wouldn't waste a device if the socket is performing correctly and you aren't having any operation issues with any of your other devices.
I have seen dozens of such 'UNKNOWN' devices on my DEV-hub when joining/removing devices frequently. They do not cause any harm (unlike the Z-Wave ghosts) and will disappear after some time.
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I think you maybe over complicating this. I’m guilty of this myself, but you should be able to just remove the 2 unknown devices and leave what is working alone.
Sorry, I don't understand. How can I remove them when they do not appear in the device list - only in the network map.
He can't remove them because they are not listed on his device list to go through the removal process.
Check this post (and the one it links back to and several replies to it) for more context) in the Zigbee Map app release topic regarding "ghost-ish" zigbee devices...
Part of the answer appears to be not to worry about them...other than the OCD issues they can cause. 
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Might have to come up with an official forum name, ZigBee Phantom perhaps. 
à la Z-Wave Ghost, two same but different things. 
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