Beacon Not Monitoring

I’m using Estimote sdk:1.0.8 , Even i have got sample Airport app also previously it was monitoring now it got stopped working.
I have added token , AppId , And beacon UUID , major & minor number but still it is same thing i’m getting.

Nougat & Marshmallow i have tested and handled Runtime permissions also
both i tried like manually took permission & SystemRequirementsChecker.checkWithDefaultDialogs(this);

Nothing changes in app what is my mistake

I have purchased the Beacon from outside the vendor. please help me