Users report being unable to update the "Listener Level" value within the Admin Console.
When navigating to Home › Environments › [Environment Name] › Advanced Settings › Event Listeners,
the "Listener Level" field does not persist the chosen value and instead displays a masked character (*) upon saving.
Fix for the issue will be provided in Fixpack 6.
If fix is needed for earlier version of v15 please reachout to support.