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Possible easier unlock for non-CN Xiaomi devices, depends on luck:
1. Sent apply for unlock in Mi community at 23:59:59 (Beijing time, GMT+8)
2. It will say application quota limit reached or whatever, ignore
3. Go to Developer settings and try to link/connect your account in Mi Unlock setting
3.1. Instead of Mi Community error it may show another error once, and second time it'll say that you need to re-login
3.2. Log out of your Xiaomi account and reboot your phone
3.3. Log into your account and try to link/connect your account again.
4. It successfully linked your account, go and download Mi Unlock app now
Note:- This is actually error from Xiaomi server side and it doesn't work for all so try your luck