We're testing out JIRA Cloud, and I'm looking at creating a rule for adding watchers to certain issues types. The problem I'm having is that when I start typing in user's names into the "Add these watchers" field nobody is showing up for selection.

I'm able to type people's names into the user fields for issues such as Assignee, and the Watchers and see users listed. Is there a different permission required for when we're creating automation rules?