Yes!
This is a common problem with MiUnlock these days... I got the approval 3 - 4 days ago, and since then, I have been trying to unlock my bootloader on Mi4c. But, it constantly failed at 50%. However, today, I finally got it unlocked.
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After that, click on the area as shown in the above picture and remove all devices. yes, trust me. After that, logout of Mi Account on your Mi4c. and factory reset your phone (if possible).
Then, when setting your phone again, and when logging into Mi Account on your phone, make sure your phone has enough credit so that it can send one international SMS. This way, your phone will register with Mi Cloud services and will activate Find Device service which is essential prior to unlocking bootloader.
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I am stuck at 50% unlocking my bootloader as many others these days. I got confirmation and UnLock tool is working fine but can not verify device.
I tried above method and my Mi4c is located fine. There are no other devices in i.mi.com.
However, I cannot do a factory reset. When going to settings etc. the phone just restarts. Of course I can't enter bootloader, as it is locked. Any advice or ideas?