MIUI 18.104.22.168.0, is exactly this your version number?
If so you have a fake rom.
I had a rom with the same version as you reported.
From when I received the phone that lasted on it the time to check the version.
Are you trying to install a xioami.eu ROM or an official one?
The device should have the bootloader locked.
Follow this guide if you want to install a xiaomi.eu rom: https://xiaomi.eu/community/threads...w-to-flash-xiaomi-eu-roms-on-your-mi5s.36132/