When setting up Mycroft, I had issues setting my location to Farnborough. I got a 500 server response when submitting the form to register my device.
I tried a town in Germany, assuming it had something to do with the time zone string, but I was able to submit that just fine. The time zone string is a red herring.
I then edited my device’s details to use the nearby town of Guildford, which also worked.
Farnborough appears four times in the list of towns if you type ‘farnb’, but the string “Farnborough” is sent in the POST request independent of which of those four you choose.