The people who are generating the code for 1st time on their phone are getting IMEI no. As code. Hence they not getting this bar code used error. However old people who already generated can't get new IMEI based codes. Also I have seen they are not Manually inserting the codes now, so that problem will not be there of used codes. I think problem is solving day by day. Sent from my MotoG3 using Tapatalk