i have 2 running mikrotik x86 setup, both are in same version of mikrotik its 7.20.8 lts,
App is missing from one router, how can i bring it back ?
Install container.npk. It’s optional.
its already installed
Are they both 64-bit?
Are you sure both are running 7.20.8? App is a feature introduced with 7.21!
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yes i am sure,
also i am thinking why its on 7.20.8 
Check device-mode on both devices.
Results of this on both?
/system resource print
/system package print
/system device-mode print
I've verified again to be sure with installations with active container package and correct device-mode setting. And there is 100% no App on 7.20.7 or 7.20.8.