After upgrading to macOS Monterey, you might see notifications like the above.
If so, the simple solution is to logout and then back in (or restart).
This seems to correct things, without any deeper delving into the issue.
Many thanks for @nstrauss and @Tyler Sparr for mentioning this on the macadmins slack, and raising an issue for Notifier too.
During lockdown we’ve been busy at dataJAR.
Not only was our website given a complete overhaul, but we also released Notifier.
Notifier is a Swift app which can post macOS alert or banner notifications on 10.10+ clients, & is what’s posted the notifications in the gif at the top of this post.
This project was originally intended for use with jamJAR, & jamJAR will soon have it’s wiki updated detailing the usage with Notifier.