@harvey186 are you sure XiaoMiTool can perform the first unlock within minutes ?
As stated on product page :
Can I unlock the bootloader without waiting with this tool?
No, official unlock procedure cannot be bypassed, this tool just replicate what the official tool does.
So, the same rules apply: you have to bind your account to the device and wait for 15 days
After reading that I went back to the original Xiaomi unlock, maybe I should have tried it anyway ?