It means if you are logged in there, it will reset the time! Just Log off!!!... and yes you can log off from pc also. No problem. You can relog in after some days using the scanner of your phone again.
Now: it says 168 hours, can I do something wrong here which makes the counter start all over again? For example: when I logg in to the Unlock Tool again: does it start all over?
And: why do you write: don´t forget to log of Xiaomi account from that device, what does that mean?
Turn on again, scan and turn off to fastboot. That simple!
I had the same issue and logged in again via email /pass (not QR code) and it worked. Make sure your xiami account settings have your phone number and sim1 is occupied by it. (Check the device status on your phone)
I'm still stuck https://forum.xda-developers.com/t/mi-unlock-not-working.4451605/
Now all you have ti do is to close the tool and run again. Login there using email and password!
Same, wtf is going on with Xiaomi. Just let us use our phone as we wish.