WorkManager.getInstance(activity).enqueueUniquePeriodicWork(\"test_work\",
You problem is not clear though please update latest work manager lib to android.arch.work:work-runtime:1.0.0-beta03
And you can explain me why do u need to enque the unique work ?
workManager.beginUniqueWork("simple_work", ExistingWorkPolicy.KEEP, simpleRequest).enqueue();
try to replace it with workManager.enque(simpleRequest);
and let me know if worked