When you type an “@”
you get a popup menu with user suggestions. After selecting a user, the mention is written thusly: @Stephen Coles
. This syntax doesn’t work. So, this is just a note that I am aware of this issue and reported it to Vanilla who is also aware of the issue and have it in their queue for fixing.
In the meantime you can make mentions work by removing the quotes and adding a “%20” between the words in a user name: @Stephen%20Coles