Just a bit more insight into this issue. 3 portals were showing the message so I wanted to see what change the recommended solution in this thread was making.
Portal 1 - Went to agent settings, clicked ok and noticed the commit link went blue.
It appears that the xml was not in the correct order and this "OK" click rearranges it.
(4/4/2020) Beginning with Applications and Threats content release version 8252, the dynamic configuration for System Tray Notification in the GlobalProtect app is removed (this option was deprecated starting in GlobalProtect app 4.1). You should expect to see a commit warning message ("GlobalProtect App Dynamic Configuration misses information for 'show-system-tray-notifications'") after you update to this or a later content release version. To permanently dismiss this warning message when it first appears, run the following CLI command in configuration mode:
delete global-protect global-protect-portal "<portal name>" client-config configs "<agent-config-name>" gp-app-config config show-system-tray-notifications
Just to qualify, what specifically worked for me, was the following;
Open each Portal Configuration>Network tab>GlobalProtect>Portals>click on each Porta>click on Agent>open the Agent listed under Configs>from the Configs window click on OK, then click OK to close the Portal Configuration screen>Commit changes to device.
Hope this helps someone.
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