MobileIron Core silently app install issues

Hi guys, whats up?
I am noob in this world of EMM, sorry if my question sounds litle stupid.

Well, I’am trying to install an “in house” app silently (Yammer)
I set the box to install silently in the app configuration, apply to label Android, but does not work.
The app appears to do the download in app@work but does not install automatically.
(Trying homologate in a Samsung Galaxy S8 - Android 8.0)

anybody can help me?

(Sorry for my bad english, is not my native language)