I had the same problem as Thaliff, I’ve tried for hours to attach my iphone 5 with the guild wars authenticator using the barcode and this pops up:
Invalid Barcode
thebarcode ‘otpauth://totp/gw2 email@address.com?
secret=LOTSOFCHARACTERS’ is not a valid authentication token barcode
How else can I get a mobile authenticator, can this be fixed?