[RN3P Kenzo] Bootloader unlocked but unable to get into TWRP

RN3P Kenzo, ROM is Global Dev 6.8.18.
I unlocked the bootloader officially (using the code and the MiFlashUnlock tool). I then used ADB to flash Cofface TWRP which did not work. These are the steps I used:

First I booted into fastboot.

Then I did this in Minimal ADB 'fastboot flash recovery twrp.img'.
The message was
sending 'recovery'
OKAY
writing 'recovery'
OKAY
finished.

Next I did 'fastboot reboot'.

Then I tried to get into TWRP recovery using the MIUI update app. Didn't work. Any help? Thanks in advance.

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