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it should be, but you must enable developer options first. settings > about phone, tap 5 times at miui version. if it still ain't there - update to the latest global stable.

you already have dev options unlocked, go there, settings > additional settings > developer options > mi unlock status, then press the button. it'll bind your phone to your account. after that - try unlocking. if it'll return an error that says something like "binding time is less than X hours"...