This means you don't have an unlocked bootloader. The fact that the Mi community app has allowed you to unlock the device does not mean that it has been unlocked. After the permission has been granted, the unlocking itself needs to be carried out. The problem is that it can only be done with the Global device.
Requirements: - You have a Global Device - Inserted SIM in the device - First, make sure your Xiaomi account is older than 30 days. - You can only unlock the bootloader of 3 devices per year using your account. download/install Xiaomi Community 5.3.31. video: https://streamable.com/7bqv4q >...
xiaomi.eu