Indeed, policy installation works when chosen by Gateways, but not policy packages.
As @JozkoMrkvicka said in a duplicated thread for the same subject, it seems to be fixed in R80.30.
Meanwhile cpm.elg on our MDM R80.20 Take 97 says the following during the run:
24/08/19 14:15:00,006 INFO policy_package.install_policy.PolicyInstallationScheduleManager [DefaultQuartzScheduler_Worker-6]: Starting scheduled install policy::run()
24/08/19 14:15:00,006 INFO policy_package.install_policy.SchedulePolicyInstallationSvcImpl [DefaultQuartzScheduler_Worker-6]: execute install policy by settings 4da321dd-1fb9-44c6-b695-10693d264f9c
24/08/19 14:15:00,011 INFO policy_package.install_policy.SchedulePolicyInstallationSvcImpl [DefaultQuartzScheduler_Worker-6]: start install policy settings : test
24/08/19 14:15:00,011 INFO policy_package.install_policy.SchedulePolicyInstallationSvcImpl [DefaultQuartzScheduler_Worker-6]: Start going over policy packages list.
24/08/19 14:15:00,015 INFO policy_package.install_policy.SchedulePolicyInstallationSvcImpl [DefaultQuartzScheduler_Worker-6]: No gateways nor policies to install for: InstallPolicyMdsSettings{owner=null, assignGlobalPolicy=false, bypassInstallPolicyInCaseOfFail=false}