Treat all opinions with a grind of salt.
Username similarity could be coincidental.
Not sure what is the “Xiaomi Community app”.
I unlocked mine Xiaomi using “Mi Unlock” app for Windows.
It worked at the first try, but I needed to download app with newer version than offered on official page.
Next step, installing new ROM via sideload.
I needed to flash low lever firmware with newer version.
Next, a sideload, without problems.
Unlocking bootloader took me few hours.
I must register new account, install Windows application (Linux not supported, but Windows Server evaluation is free and works as a VM),
have valid SIM card with Internet access.
But worth it, much better experience.
Unfortunately, average person won’t do all this things.
Sony Trinitron disagrees