It can be useful in certain situations if DisplayName is added
in the mod joined notification text, i.e.
This is to notify you that DisplayName ...@... has joined your group...or alternatively,
This is to notify you that ...@... (DisplayName) or [DisplayName] has joined your group...Even without the bracketing it would help catch if someone (user or mod) forgot to add a DisplayName on the profile (when this is a group policy), and especially when working with a multi-mod group in such group.
Thanks and Cheers,