This is an awkward one, as Daniel says locally Shrewsbury is Yr Amwythig. Would Llwydlo, Llanllieni or Croesoswallt be better places at this stage, if you want an English town with a Welsh name close to the border?
So why is the usual "dw i'n hoffi" not an option in this case? Does it have to do with Shrewsbury starting with "Yr", or is this a bug? If this is a mutation thing…it's not something we've encountered before, nor has it been explained.