I notice when tagging a member, often the autocomplete is available, however for some users there is no autocomplete.
These are ot banned...
I have noticed some user registerations starts with [ and ends with ]. In that case user mention does not seem to work. For example @[username]
As title. Confirmed on our test site with no add-ons and on the default style:
Thanks to @Liam W for helping me test. I saw it yesterday, too, but just wanted to make sure it wasn't a hiccup in my email client.
Separate names with a comma.