I have been controlling Heathrow GND and TWR this morning and noticed “Unknown” aircraft. Why is this, both of them continued to ask for pushback but I couldn’t respond! When clicked on it just said “Unknown” again.

If there is an unknown it is best just to work around them

RIP Unknown ☹️ So lonely

How come it says unknown?

It is most likely that their connection is bad. Not much that you can do about it.

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