With some phones you need to go through extra steps to be able to do OEM unlocking. Looks like it is the case here, see the steps in the FAQ linked here : https://en.miui.com/unlock/download_en.html
I've never used miui devices but I think you need to make an account and use this https://en.miui.com/unlock/download_en.html so you will probably need to have wine installed to run it, unless it has a native linux version in the zip file. Then you should have an unlocked bootloader
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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