When my Windows 10 Enterprise (Build 1909, all patches) system was updated with the most recent endpoint client update (EAP), the message that was displayed by the windows message center to tell me to reboot to take advantage to the update appeared to be displaying program variables or placeholders instead of a proper message. I did not get a screencap of that, but if you look at the attached screenshot of the events list for this machine, you can see the exact text that was displayed. Not a major issue, and maybe it's a one-off thing, but if not, hopefully this can be rectified so rank and file users will better understand what is being asked of them with this new windows alerting integration.
