Keep in mind, Especially for Xiaomi, credit is for Xiaomi Flashing[XIAOMI FL] only,
This service is not for unlock bootloader or clear mi account, there are another service for that.
And you are using wrong button for this.
Xiaomi authorize bootloader consist of three part, for read, write and erase function under EDL mode for Qualcomm devices, means everytime you want to make Identify(read), erase partitions, doing special task(write), and flash(write) this will ask authentication via authorize service.
Read every possible hint, clue, post, forum, ask friend before using credit, so you can safe time and money.
For UBL xiaomi, there are free cost service for specific model only, and the operation is available under fastboot tab. You can follow this discussion how to do that.
GudLuck to you.