Dropdown names don't show for all users

Question

I have a field in Jira Service Management called Executive Sponsor.  The field uses a Group to populate the names.  I am using this field in a form.  For some reason, not everyone is seeing the list of users in this field.   We have many user that click on the dropdown and are able to start typing the name to filter the list.  Others, don't see anything and even when they start typing, nothing appears.  What could be causing this issue?

Colleen Gotling · Accepted Answer

I was able to figure it out.  It was actually in the Customer Permissions in the Project.  I had to check  "customers can search for other customers within their project or organization".