Try using a test alarm message first, and see if you can get that to show up.
Trigger the "blank" alarm message and see if it shows up in the Alarm History or a new test alarm banner screen. If the alarm is triggered, it has to show up somewhere.
Font type, font size could be an issue in the banner if they are too large. Font conversion usually causes size problems somewhere (from old PV font to new font).
really, just guessing here without seeing the project. But get a test alarm message working first, then figure out why the other alarms are not showing (problem with trigger, remote ack, alarm banner settings, alarm system, etc).