Good to know that you probably fix the issue (based on the edit) !
Just to be sure a future Jira user find this page with this kind of problem, there's a page named notification helper that can help to understand what's wrong : Jira admin helper
Addditionnally in this kind on case you should verify if the mail of the user is correct !
Have fun with Jira!
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.