At a quick look, the significant thing I see is that your Mi Unlock status says “This device is locked”. To what extent have you followed this? I see you already added / associated your Mi Account.
Register > associate phone > apply to unlock > ok, “wait some time” > time goes by > ok, “you are free to unlock it” > Connect the phone > a token is exchanged > you do something > the device is unlocked.
I do not remember the exact words or steps, they are very precise, do you think you did all those steps or where in the process are you?
I believe you are required to put the SIM in the phone, register, use the phone “normally” for all of the duration of the process. I read that the SIM should not be used in another phone.
To protect myself from that I got a “demonstrator” SIM from a supermarket for the job!
In your Mi account it will tell you clearly if the countdown has started. If you see that, you will know the answer !
If you do not see that, perhaps the countdown has not started !
If you plan to change SIM, this is what I would do. Start a NEW Mi account, put an avatar on it so that you do not get in muddle. Go back to your first account, delete the device from it; check it got deleted; delete the account.
On your device install the new SIM; register it with your new account; and start all over again.
It’s working now. It’s strange, I buy a prepaid card, I think I have to wait 15 days but I do the manipulation with the Mi account and it’s unlock right away… strange but cool.