xiaomi phone encryption

Hi..

Apology is this have been answered before, I did search but couldn't find any info..

When I setup my corpotate email account on my xiaomi Mi3 phone it asked me to encrypt the phone.. so I get a screen with "Encrypt phone" button, when I click the button it shows me black screen when green (outline) android and that's it.. nothing happen after that no matter how long I leave the phone..

I remeber when I had nexus 4 with pure android ROM it shows the same screen but under the android...

xiaomi phone encryption