The information on Unlocking the bootloader
(N° 1. - 8.) in the /e/OS documentation is still wrong!
Xiaomi’s stock firmware AndroidONE was and is the only Xiaomi firmware version that is not subject to Xiaomi’s usual unlock procedure. Here the bootloader of AndroidONE 8.0/9.0 can be unlocked immediately without a Xiaomi account and without waiting a second via fastboot flashing unlock
.