Why can't I use NFC tag to unlock with Smart Lock?

[AC Question]

I've enabled Trust Agent, added Trust Device (NFC Tag), use PIN code for lock screen. When I turn off and on my phone, there is a pulse circle around lock icon so Smart Lock definitely turn on. But when I tap my NFC tag on back of my phone, there's nothing happen. I have to unlock with my PIN code. Once my phone unlocked, there's immediately a sound of NFC tag found.
I'm using Android 6.0.1 Cyanogenmod, rooted. Google play service lastest version.
Xposed modules installed: Greenify, Gravitybox[MM], Screenfilter.
How can I fix it? Thanks.