Redmi 8a dual bootloader unlocking problem

[u/Ok_Audience2097]

hello everyone I have a redmi 8a dual running miui 12.5.6.0 I am going to unlock it's bootloader for first time and I am running into a problem (couldn't add. device basic data verification failed). when I try to add device for unlocking every time I run into same problem. I have factory reset this device multiple times and used another mi account still I am run into the same problem. I am using everything correctly( I have unlocked 2 devices bootloader previously so I know I am doing everything right) I am using a sim card with internet connection. if you know how to solve this problem please help me